Slack to Teams Membership Limitations
Understand channel member limits when migrating to Microsoft Teams.
Overview
When migrating from Slack to Microsoft Teams, it's important to understand that Teams has specific membership limits for different channel types. These limits may affect how Slack channels are migrated.
Planning Required
Review your Slack channel membership before migration to identify channels that may exceed Teams limits.
Teams Channel Limits
Private Channel Limit
250 Member Maximum
Microsoft Teams private channels have a hard limit of 250 members. This is a Microsoft platform limitation that cannot be increased.
Impact on Migration
- • Slack private channels with more than 250 members cannot be migrated as private channels
- • Excess members will not be added to the migrated channel
- • Migration may fail for these channels without proper planning
Identify Affected Channels
Before migration, export your Slack channel list and identify any private channels exceeding 250 members.
Workarounds
Options for Large Channels
Convert to Standard Channel
Migrate the Slack private channel as a Teams standard channel instead. Standard channels inherit team membership and have no separate member limit.
Create a Dedicated Team
Create a new team specifically for this group. Teams can have up to 25,000 members, providing much more capacity.
Split the Channel
If the content must remain private, consider splitting into multiple private channels organized by department, region, or function.
Prioritize Members
If private channel is required, identify the 250 most critical members and migrate only those. Others can be added to a parallel standard channel.
Microsoft Documentation
Teams Capacity Summary
| Channel Type | Member Limit |
|---|---|
| Standard Channel | Inherits team membership (up to 25,000) |
| Private Channel | 250 members maximum |
| Shared Channel | 50 teams maximum |