Follow the steps below for Slack to Microsoft Teams migration, including channel selection (public or private). If you wish to use this new version, please contact us.
Cloudiway’s Slack migration solution helps businesses perform technical migrations through a simple SaaS interface. As a result, Slack to Teams migrations require no additional software installation or overhead, and migrations can be performed securely and quickly.
This guide is aimed at experienced system administrators who are capable of connecting to remote systems and using a variety of administration tools.
1.1. Performance & Security
For more information about security, please refer to this article.
For more information about migration performance, please refer to this article.
1.2. License Management
Cloudiway platform automatically assigns the licenses, for more details regarding the license management, check out this page.
1.3. Delta Passes
Delta migration is a Cloudiway functionality that allows you to migrate incrementally. Changes are migrated during delta passes. Deletions are not propagated.
Although we provide support for our own products, we do not provide support for third-party products such as PowerShell or server administration of Microsoft or Slack products.
If you are concerned you might have any difficulty completing these steps, please consider a solution with our consulting team, contact us. This will ensure a fast, cost-effective, and stress-free implementation.
2.1. How it works
Migration to Teams uses a mix of Graph APIs and CSOM calls. Therefore it requires to configure specific permissions at the source and at the target to execute Graph and CSOM calls.
Migration from Slack requires to set up an OAuth authentication with appropriate permissions.
2.2. Mapping Table
In Slack, there are permissions and metadata (createdby, modifiedby, etc.) that contain email addresses. During the migration, these addresses must be converted into target accounts.
To achieve this, Cloudiway uses a mapping table to perform the conversion.
Important: the mapping table must be exhaustive, any missing email address will not be converted, and would end up with the loss of permissions and metadata.
Prepare your mapping table for users and groups/teams in CSV format, ready to upload later on.
2.3. Target Prerequisites
We recommend to create an Office 365 account dedicated to the migration, that can be deleted once the migration is completed.
Cloudiway automatically creates the team, therefore it doesn’t have to exist prior to the migration. If it already exists, it will be used and data appended to it.
2.4. Azure Active Directory Application
Graph APIs calls are performed through an Azure Active Directory Application which is granted specific permissions.
You can either create an Azure Active Directory Application manually or let the platform create one for you.
Please consult our How To Create Azure Apps Registration page to create the Azure Active Directory Application and associated permissions.
To facilitate the Slack to Teams migration, the Cloudiway platform needs to be able to communicate with both your source and target domains. To do this, Cloudiway uses connectors. You will need to set up a connector for each source tenant and each target tenant. Please refer to this page to configure your connectors.
For large projects, it’s possible to create multiple connectors that will be used in parallel. Please contact Cloudiway consulting services if you need to set up such configuration.
Note: to test the migration, you can use a Trial License, please consult this article to assign a Trial License.
To perform the migration, navigate to Sites > Group List
4.1.1. Option 1: Get List
Use the Get List option to fill the list of Slack channels to migrate:
This will connect to Slack and retrieve all available channels.
Select the connector you want to connect, click on GET.
Note: you can monitor the progress of this task in the Global Logs.
Once the list is retrieved, you need to assign a target connector to the entries.
Select the entries, click on MANAGE, then Assign Target.
Select the connector, click on Assign.
4.1.2. Option 2: CSV Import
If you have a CSV file of all your channels, you can upload the file to Cloudiway.
The file must have the following fields in the header row:
|SourceName||The site name|
|SourceId||The relative URL of the site|
|SourceEmailAddress||Not used, leave blank|
|SourceRecipientType||Enter Classic or ModernSite|
|TargetName||The target site name|
|TargetChannelName||Not used, leave blank|
|TargetEmailAddress||Not used, leave blank|
|TargetUrl||The relative URL at the target|
|TargetRecipientType||Enter Classic or ModernSite|
|TemplateName||The name of the template|
|Description||Short description of the site (without special characters)|
Click on MANAGE, Import, select the CSV File, the Source and Target Connectors, then click Upload.
You can migrate your Slack to different teams or to different channels (public or private) within the same team.
When migrating a Slack channel into a Team, you have 3 options:
If you want to migrate into a specific channel of a Team instead of the General Channel, in the Target Name field, you have to specify the name of your Team and the name of the Channel in the Target Channel Name field.
If the Team or the channel doesn’t exist in the target, they will get created with the pre-processing task.
Please beware that the chat messages are posted with a timestamp of the migration and will appear on the bottom of the message thread. Also, please note that if you get a message error and you restart the migration, that message will be pushed during a delta pass and will appear again on the bottom of the thread (this will cause a chronological disorder in the messages). This is a Microsoft Graph API limitation.
Click on Mapping Table.
You can upload a User or Group list via CSV (use IMPORT) or CREATE your entries manually.
A template of CSV file is available on the platform when you click on IMPORT.
EntryType: enter 0 for user, 1 for group.
FirstName and LastName: Leave blank for group.
At this point, you are ready to migrate.
You can review the settings in Global Settings.
|Membership Migration||Enable the migration of team members|
|Conversation Migration||Enable the migration of channel Conversations, read more.|
|Planner Migration||Enable the migration of Planners|
|Mailbox Migration||Enable the migration of team mailboxes|
|Mentions Migration||Enable the migration of Mentions|
|Migration of TermStore||Enable the migration of TermStore, therefore you can safely leave it Off by default unless you have customized it.|
|Migration of Permissions||Enable the migration of Permissions (files permissions...)|
|Migration of Sharepoint||Enable the migration of SharePoint sites associated to the team|
|Keep in target||Keep files if already present at the target (existing files will not be overwritten)|
This feature reports information about the Source Slack:
To Audit a Slack team, in Group List, select it and click on MIGRATION, Audit.
The pre-processing tool creates the team at the target if it doesn’t already exist.
What does the pre-processing tool do in detail?
At the target:
To pre-process a team, in Group List, select it and click on MIGRATION, Pre-Processing.
The group or team is now ready to be migrated.
Before starting the migration, you must run the pre-processing (see step above) of the slack team.
To start the migration, in Group List, select it and click on MIGRATION, Start.
This will schedule the migration. The migration will start as soon as there is a free spot on the platform.
You can monitor your migration by clicking on the team on the list.
Cloudiway provides an extensive knowledge base with many resources, including common error messages, video guides, and downloads.
Please visit the knowledgebase here: https://help.cloudiway.com/