Slack to Teams Migration Guide for IT Admins

If you are exploring secure and high-performance solutions for your company’s upcoming Slack to Teams migration, you are in the right place. Use this guide to learn about the challenges, trends, use cases, and solutions (including CloudFuze), and streamline the planning process.

1. Introduction

Migrating Slack to Microsoft Teams involves transferring channels, direct messages, attachments, pinned messages, threads, reactions, mentions, timestamps, and more, of each user.

Considering that you need to move all the core aspects of Slack messaging, it’s important to take a strategic approach during planning, preparing, testing, migrating, and validating stages.

Explore all the migration steps in this guide. To quickly get started, watch this migration video:

2. Slack vs. Microsoft Teams: Key Differences for IT Admins

Before planning and starting a Slack migration to Teams, IT admins need to understand the structural differences between the two platforms. These differences affect how channels map during migration and how users adapt post migration.

NOTE: This comparison table draws information from July 2026 data. It may change when Slack and Microsoft update product features.

3. Channel Differences to Know When Transitioning from Slack to Teams

Understanding how channels and conversations work in Slack and Microsoft Teams is highly important before planning the chat migration.

In Slack, channels are designed to be flexible spaces for group discussions and are best suited for short-term needs. Whereas, in Microsoft Teams, channels are designed to be structured spaces for organized and long-term group conversations.

It is important to take into consideration these fundamental differences and communicate about them to help users adopt Teams properly. For example, you can train and encourage users to use channels and reply within threads to maintain context for long-term conversations, such as daily updates.

Also, in many companies, conversations in Slack are often rapid and informal, whereas in Teams, they are often more organized with threads. So, to help users cope with the change, you can encourage them to get comfortable with threading replies in Teams.

4. Planning Slack to Teams Migration

A proper plan lays a solid foundation for a successful Slack to Teams migration journey. Therefore, your team must focus on creating a proper migration plan that addresses your company’s needs and goals.

a) Pre-Migration Analysis

One of the most important stages of any Slack to Teams migration is pre-migration analysis. With a proper pre-migration analysis, you can determine what needs to be migrated and plan the scope of work accordingly.

When performing a pre-migration analysis, make sure to focus on these parameters:

• Check the total number of channels to migrate
• Check the total number of users to migrate
• Finalize the message metadata types of preserve

b) Deciding Which Content and Channels to Retain or Leave

One of the most important decisions to make when planning a Slack to Teams chat migration is to finalize which Slack content and channels to transfer and which ones to leave. Here are some of the important steps to take:

• Review channel activity: Understand user activity in each channel and check for metrics like message volume, member participation, last activity date, and more. This helps you differentiate active channels from idle ones.
• Get input from channel owners: By taking inputs from public and private channel owners, admins, and department leads, you can understand which channels are important for ongoing operations.
• Consolidate channels: If you have similar or overlapping Slack channels, it’s best to merge their content to make the overall scope of migration lightweight.
• Differentiate must-haves from nice-to-haves: Not all channels and content may be important. By checking all channels, understand which ones are important and which ones are not. You can then archive the less important channels.

c) Communicating with Stakeholders

Communication with users and stakeholders is often an oversight. To make sure it does not get overlooked, develop a comprehensive communication plan that lays out the approach for communication with the users about the chat platform transition and communication with the migration partner in all the stages of the project.

5. Preparing for the Migration

Proper preparation lays a solid foundation for complete Slack to Teams migration success. Here are some of the most important preparation steps to take:

a) Choosing a Slack to Teams Migration Tool

Choosing the right Slack to Teams migration tool will steer your company into the right path of the migration journey. When exploring migration tools, be sure of your company’s migration use case and goals.

Equally important is to weigh in the security and compliance requirements. Scalability, change management, and post-migration integration are some of the other important factors to consider in migration service.

b) User Mapping

With proper user mapping, your company can move from Slack to Teams with a high level of accuracy. When creating CSV mappings, make sure to use proper syntax and folder paths to avoid inaccuracies.

Also, validate the CSV user mapping paths with the migration partner before adding them to the migration tool.

c) Checking Message Sprawl and Remediating It

CloudFuze’s data sprawl control feature enables you to get complete visibility into Slack channels, members, channel creation dates, messages and files in each channel, and direct messages of each user. Based on the insights it surfaces, admins can perform clean-up actions in their Slack environment.

Migrating chat messages without sprawl is especially important if your company plans to adopt Copilot and other AI tools and agents post migration.

d) Admin Login Details

You must be ready with the login details when adding and authenticating your company’s Slack and Microsoft Teams cloud. Make sure that you or your team members have quick access to the Primary Workspace owner’s login details for Slack and Global Admin’s login details for Teams.

e) Managing Access to Slack When Migrating to Teams

Our Slack to Teams migration tool transfers chat messages in the background which allows users to continue using Slack. The incremental changes made during the one-time migration can then be migrated using our tool’s delta migration feature.

It is also important to set a clear cut-over date and schedule it after the migration completion and validation phase.

f) Ensuring Users Are Ready for Transitioning from Slack to Teams

Apart from the IT team and other stakeholders, the end-users must also be ready for the chat platform transition. But how do you do this? Consider some of these approaches to help them get ready:

• Evangelize about the platform transition: Help users understand the benefits of making the chat platform switch. A clear understanding of the migration’s reasons and benefits can help users become ready.
• Ensure extensive user training: Providing structured training to users helps them understand the chat functionalities of Microsoft Teams. This way, they can smoothly adjust to the changes in configurations and workflows post-migration.
• Share Teams adoption resources: Apart from training, it is also important to share Teams adoption resources to help users onboard smoothly without any impact on their workflows and productivity.

6. How to Migrate from Slack to Microsoft Teams (Steps)

These steps show how IT teams can use CloudFuze to migrate Slack to Teams along with channels, direct messages, users, files, and other features. The following are the prerequisites for the migration.

• Slack admin login credentials
• Microsoft 365 (Office 365) admin login credentials
• A CloudFuze account

Don’t hesitate to get in touch with our migration team for a quote or to request a trial.

1. Log in to CloudFuze

Go to webapp.cloudfuze.com and create a CloudFuze account. We offer a limited 30-day trial account for users who want to test the service. IT administrators can reach out to our migration team for a live demo or quote.

2. Add Your Slack Account to CloudFuze

Locate the Slack cloud in the business clouds list and click on it. A popup will appear where you need to enter Slack account details.

3. Enter Slack Login Credentials

Enter your company’s Slack login details and click on the Sign-in button.

4. Provide Access to CloudFuze

Click on the Allow button to provide access to CloudFuze.

5. Add Microsoft Teams to CloudFuze

Click on the Microsoft Teams cloud that you can see in the business clouds list.

6. Authorize Microsoft Teams

Click on the Accept button to complete the authorization process.

7. Verify Whether Slacks and Teams Are Added

Click on the Clouds tab and go to the Manage Clouds tab. If successfully added, both Microsoft Teams and Slack accounts will be displayed there.

8. Click on the Slack Migration Tab

Click on the Slack migration tab in the navigational menu on the left and click on it.

9. Select the Source and Destination Clouds

Since it is a Slack to Microsoft Teams migration, we need to select Slack as the source and Microsoft Teams as the target/destination cloud. Ensure to get the sequence right. The wrong choice will end up migrating Team’s content (if any) to Slack.

10. Select the Users to Migrate

Our Slack to Microsoft Teams migration solution maps users automatically based on their email aliases. IT admins can still migrate users’ chats, channels, and workspaces to Teams irrespective of the auto-map list.

11. Select Workspaces and Start the Migration

CloudFuze pulls and displays the list of all workspaces in your Slack account. Click on the Channels tab next to Users to view all of them. Check the Private Workspaces. Now, click on the Private option to view all the Private workspaces in your Slack account. Once done, start the migration process.

12. Slack to Microsoft Teams Migration Is in Process

Go to Reports and check for the status of the migration. During the chat migration process, the status will be displayed as In Progress.

13. Migration Has Been Completed Successfully

Once the migration is completed, the status will be changed to Processed from In Progress.

14. Select Direct Messages

Our tool maps users automatically and migrates Slack direct messages to Teams with all the features.

15. Messages Are Being Migrated

By clicking on the Next button, direct messages will migrate from Slack to Teams.

16. All the Direct Messages Have Been Migrated

When all the DMs are migrated, CloudFuze displays the status as Processed. Users can log into their Microsoft Teams accounts to validate whether all messages are properly migrated.

7. Post-Migration Activities

After the chat transfer process gets completed, you must complete a few post-migration tasks to ensure proper completion of the migration project. Here are the high-level tasks to focus on:

a) Delta Migration

Make sure to perform a delta sync after the one-time migration is completed. This way, you can have the incremental changes transferred to Teams and keep users on Teams updated with the latest versions.

b) Migration Validation

Validate each user batch as and when they get migrated to Teams, during one-time as well as delta migration.

This sequential validation approach helps you check the accuracy of the migration in a lightweight way without risking a buildup of multiple user batches which, otherwise, can be complex and time-consuming to validate.

c) Post-Migration Integration

Re-integrate and sync data with the third-party apps in Teams that your company had in Slack.

This helps maintain a sense of familiarity for the end-users and streamlines the change management process. In case the apps you relied on Slack aren’t available on Teams Marketplace, you can look for alternatives.

d) User Onboarding and Go Live

Onboard the users to Microsoft Teams after completing the post-migration integration. Provide them with proper training to enable them to make the most out of the collaboration features that Teams offers. Once done, adopt Teams organization-wide.

8. CloudFuze’s Slack to Teams Migration Tool

CloudFuze enables large enterprises, mid-market organizations, and MSPs to migrate Slack to Microsoft Teams with complete data coverage and enterprise-grade security.

As a Microsoft Migration Partner listed on Microsoft AppSource, CloudFuze is one of the few platforms in the industry that migrates direct messages, timestamps, pinned messages, user groups, non-admin private channels, emojis, and all other context alongside channel content.

Unlike Microsoft’s native tool and other migration tools, CloudFuze supports multi-workspace migrations, delta migrations, and time period filtering, giving IT admins precise control over what gets migrated and when.

9. CloudFuze Platform Features

CloudFuze migrates all core Slack data types to their equivalent destinations in Microsoft Teams.

What CloudFuze migrates:

• Public and private channels (mapped to Teams channels)
• Direct messages (one-to-one chats)
• Group direct messages (group chats)
• Channel members and user groups
• Threads, @mentions, and replies
• Attachments and files
• Emojis and reactions
• Pinned messages (including DM pinned messages)
• Timestamps for channels and direct messages
• Text formatting (bold, italic, strikethrough, numbered lists, bullet lists)
• Code blocks (migrated as formatted text)

Migration modes:

• One-time migration
• Delta migration (for migrating incremental changes)
• Time period filtering (example: last three years only)

Technical specifications:

• RESTful API platform with cloud-native architecture
• OAuth 2.0 authentication for Slack and Microsoft 365
• RSA 2048 encryption for all data in transit
• SOC 1 and SOC 2 certified US-based data centers
• Deployment options: SaaS for small migrations, dedicated instances for large migrations, or deployable in customers’ cloud or data center (intended for enterprises, universities, and government agencies).

10. Slack to Teams Migration Case Studies

As a Microsoft Migration Partner, we at CloudFuze have helped many companies migrate from Slack to Microsoft Teams with our solutions tailored to their use cases. Here’s one such example:

Case Study highlights: Stryker, a leading medical technology company, had acquired a company and wanted to selectively move their Slack users to Teams. With our solutions, they were able to sort through a vast pool of users, strategically select and map them, and migrate them over to the existing Teams environment. Explore the Stryker case study to dive deep into more details.

CloudFuze’s Slack to Teams migration approach has also been cited in industry coverage as an example of how enterprise migrations should be handled. Read the UC Today case study coverage.

Our dedicated experts can help your team carry out a strategic Slack to Teams migration project without disrupting your business operations. For more details on how to migrate your business data from Slack to Teams, contact our migration experts.

11. CloudFuze vs. Competitor Migration Tools

Compared to Microsoft’s native tool and other migration tools, CloudFuze provides broader migration scope coverage by supporting direct message migration, preservation of intricate messaging metadata and context, and flexibility for more deployment options. Here is a comparison.

12. Major Slack to Teams Migration Challenges

Migrating from Slack to Microsoft Teams comes with technical and operational challenges. Understanding them before the project starts helps IT admins build a realistic plan.

a) API rate limits and data volume

If your Slack data volume is large, you are at higher risk of hitting Microsoft API rate limits during migration, which can cause data loss or incomplete transfers.

A managed migration service with dedicated infrastructure handles rate limiting automatically and monitors the migration in real time.

b) More than 1,000 channels in a single workspace

Microsoft Teams has updated the older limit of 200 channels per team to support up to 1,000 channels per team.

Organizations with Slack workspaces that exceed 1,000 channels need to plan for distributing those channels across multiple Teams, consolidating inactive channels before migration, or both.

c) Unsupported characters in file names

Slack allows file names and special characters that Microsoft 365 does not support. Without automated handling, these files fail to migrate or land with corrupted names.

CloudFuze automatically identifies files with unsupported names or special characters and replaces them with underscores or hyphens to ensure clean migration.

d) User mapping complexity

Aligning Slack user accounts with Microsoft 365 user accounts requires accurate mapping, especially in M&A scenarios where email domains differ. Having a proper plan to map users manually in CSV formats with expert support plays an integral role.

e) Maintaining business continuity during migration

Larger organizations cannot afford to pause Slack access while migration is in progress. CloudFuze migrates messages in the background, which allows users to continue using Slack while the transfer happens. The tool then mirgates incremental changes through Delta sync.

13. Security

CloudFuze is trusted by large enterprises and US government agencies for Slack to Teams migration. All data in transit is protected using RSA 2048 encryption.

Migrations are executed via API calls, which means your SaaS data is never written to CloudFuze’s servers. The data moves directly from source to destination. CloudFuze operates from SOC 1 and SOC 2 Type 2 certified data centers in the United States.

For organizations in regulated industries, CloudFuze also supports deployment inside the customer’s own cloud environment or data center, which gives IT and security teams full control over where the migration process is run. Read more about CloudFuze Security.

14. Slack to Teams Migration Trends and Use Cases

Microsoft Teams now has a significantly more number of monthly active users compared to Slack. The gap has widened as organizations increasingly consolidate their collaboration stack around Microsoft 365.

The decision to migrate Slack to Microsoft Teams is no longer primarily a platform preference decision for most enterprises. It is driven by license consolidation, AI readiness, and the pressure to standardize on one ecosystem.

The most common use cases we see at CloudFuze:

a) Microsoft 365 Consolidation

Organizations running SharePoint, OneDrive, and Outlook move from Slack to Teams to reduce redundant licensing costs and consolidate all collaboration under the Microsoft 365 ecosystem.

Teams is included in most Microsoft 365 plans, which means Slack becomes an additional cost that many CFOs want eliminated.

b) AI Readiness and Copilot Adoption

Organizations rolling out Microsoft 365 Copilot need their collaboration history inside Microsoft Teams for Copilot to surface it.

Conversations, files, and threads that remain in Slack are invisible to Copilot. Therefore, migrating Slack to Teams becomes a prerequisite for organizations that want Copilot to have full context of their team’s work history.

c) Mergers and Acquisitions

When two organizations merge and one runs Slack while the other runs Teams, IT teams need to migrate Slack channels and direct messages to Teams while preserving historical context, including messages, threads, user mapping, and more, so that the merged team can operate from a single platform.

d) Government and Compliance-Driven Migration

Organizations in regulated industries such as healthcare, finance, and government, are moving away from Slack to leverage Teams’ advanced compliance capabilities, including eDiscovery, retention policies, and Microsoft Purview integration.

15. Benefits for Companies and IT Admins

The following are the benefits that companies and IT teams get when choosing CloudFuze as the migration partner.

a) Complete data migration, nothing left behind

CloudFuze migrates channels, direct messages, files, timestamps, threads, emojis, pinned messages, user groups, and more. Some of these data types are not supported by Microsoft’s native tool and many other Slack to Teams migration tools.

b) No disruption to existing workflows

Migration runs in the background. Users continue working in Slack until the cutover date, and delta migration transfers all the incremental changes made during the one-time migration stage.

c) Microsoft 365 Copilot readiness

Migrating your organization’s Slack chat history into Teams puts all your collaboration data inside the Microsoft 365 ecosystem and makes it accessible to Microsoft 365 Copilot. So, the migration is not just about transferring chat data but also now about being AI ready.

d) Licensing cost reduction

Consolidating on Microsoft Teams eliminates Slack subscription cost. For organizations on Microsoft 365 enterprise plans, Teams is already included which makes the ROI on migration immediate.

e) Enterprise-grade security and compliance

SOC 1 and SOC 2 Type 2 certified infrastructure, RSA 2048 encryption, and flexible deployment options meet the security and compliance requirements of regulated industries and government agencies.

f) Managed migration service

CloudFuze’s team handles the migration end-to-end via a managed migration service, which reduces the load on internal IT teams and helps ensure the project is completed on time and within scope.

Conclusion

Migrating from Slack to Teams with complete success requires careful planning and execution. With our solutions and managed services, you can migrate your company’s Slack workspaces, channels, users, messages, and metadata with a high ROI for the first year and subsequent years.

Discuss further with us. Let’s hop on a call and discuss how we can tailor our solutions to meet your company’s Slack to Teams migration requirements.

Frequently Asked Questions

1. How do I migrate from Slack to Microsoft Teams?

To migrate from Slack to Microsoft Teams, you need to connect both your Slack workspace and your Microsoft 365 tenant to a migration tool, map users, select the channels and direct messages to migrate, and run the migration.

2. Can Microsoft’s free Slack migration tool migrate direct messages?

No. Microsoft’s native Slack to Teams migration tool only migrates channel content, including public and private channels, channel messages, and channel files. To migrate Slack direct messages, group direct messages, and rich metadata and context, organizations need to use the third-party migration tool like CloudFuze that has API-level access to direct messages and the ability to map them to Teams personal chats.

3. How Much Does It Cost to Migrate from Slack to Teams?

The cost to manage Slack to Teams depends on the number of users, the volume of data (messages and files), the level of metadata preservation required, and whether you want to use Microsoft’s free native tool or a third-party platform. Microsoft’s admin center tool is free but limited to channels. CloudFuze pricing is scoped based on user count and data volume.

4. How long does a Slack to Teams migration take?

Migration time depends on data volume, the number of users, and the number of messages and files. Small migrations (under 500 users with monitored data) typically complete within a week. Large enterprise migrations can take several weeks and months, particularly when data migration and validation phases are included.

5. Does CloudFuze migrate direct messages?

Yes. CloudFuze migrates Slack direct messages to Microsoft Teams along with message history, timestamps, attachments, replies, reactions, user mentions, pinned messages, and more.

6. Does CloudFuze migrate timestamps?

Yes, CloudFuze migrates timestamps of public/private channels and direct messages between users. Timestamps for groups can also be migrated.

7. Does CloudFuze migrate Slack files?

Yes. CloudFuze migrates all files from Slack channels and direct messages to Microsoft Teams. Channel files land in the associated SharePoint library. Files with names containing special characters that are unsupported by Microsoft 365 are automatically renamed using an underscore or hyphen to ensure a clean transfer.

8. How secure is CloudFuze for Slack to Teams migration?

CloudFuze is trusted by large enterprises and U.S. government agencies. All migration data travels via API calls using RSA 2048 encryption. CloudFuze operates from SOC 1 and SOC 2 Type 2 certified data centers in the United States and supports deployment inside a customer’s own cloud or on-premises infrastructure for organizations with strict data residency requirements.

9. How to Check the number of users in a Slack account?

Log in to your Slack account. Please keep in mind that you must log in as admin to retrieve the user’s info. Go to Settings & Administration and click on the Workspace Settings option.

From the Administration menu, click on the Manage Members tab. All the user’s information will be displayed there.

10. How to check file data metrics in a Slack account?

Slack primarily shows the data of the number of messages sent and the number of files. It doesn’t show the data size in GBs or TBs. To check the metrics, click on the Tools option from the main menu and click on Analytics.

Click on the Messages Sent or Files Uploaded tabs to check concerned analytics.

11. How to contact CloudFuze?

You can chat with our migration team by clicking on the chat button on the bottom right corner of this page. Alternatively, you can submit your query, and our team of experts will contact you.

12. Can you migrate data from Slack to Teams?

Yes, CloudFuze can migrate data from Slack to Teams. In addition to migrating Slack channels and direct messages, our tool can also transfer files from Slack to Microsoft Teams.

13. How to migrate direct messages from Slack to Teams?

Currently, there is no manual option or free Slack to Teams migration tool that can migrate direct messages from Slack to Teams. CloudFuze is the only complete solution in the world that can migrate a lot of Slack features to Microsoft Teams.

14. What level of support does CloudFuze provide?

Each business migration at CloudFuze gets a dedicated migration team with a migration manager. CloudFuze is highly known in the industry for its managed migrations.

15. What are the prerequisites for Slack to Teams migration?

In order to migrate from Slack to Teams, you must be a Slack admin or have Slack admin login credentials. You must also have admin access to the Microsoft 365 account.