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    Home > Microsoft Teams Migration Process > Preparation

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    Preparation

    Before the migration, you need to identify what object types you want to migrate. See the .

    1. Create a service account or app profile with required permissions

    To connect Fly to your Teams, create a service account or an app profile with the required permissions in AvePoint Online Services. In general, you need to grant the following required permissions to the service account before the migration:

    - Team Owner - Licenses for Microsoft Teams and Exchange Online - Owner of source private channels - Mail Recipients roles

    Refer to the latest to check the required permissions for Microsoft Teams Migration.

    2. Run the source tenant discovery (optional)

    Before you migrate from Microsoft Teams, you can run a tenant discovery of Microsoft Teams to scan and report the object count, object type, object size, and other details. According to the discovery reports, you can better understand your source environment and plan for your migrations. Refer to the for details

    3. Create users in destination tenant or sync AD users

    User mappings are required when executing migrations. Make sure users of the following data are created in the destination tenant before the migration.

    - Team Membership - Task: Assign To - Conversation sent by - Mail: To, Cc, Bcc, etc. - File: Modified by and Created By - Permission - Other data that needs users

    Refer to the .

    4. Assign license to users

    If you want Fly to assign the Team Owner role to destination users in the migration, the users must have Microsoft 365 licenses. We recommend that you assign Microsoft 365 licenses to all destination users for easy use.

    5. External users

    External users cannot be migrated in the migration. You can export external users and import them into the destination tenant before the migration. The following actions are required:

    - **Export and import external users**. Refer to the following steps to export external users and import them into the destination tenant: 1. Make sure you have the Azure AD PowerShell Module installed before running the scripts. See instructions . 2. Run the PowerShell script to export the external users from the source tenant to a CSV file. (You can click the to download the script.) 3. Run the PowerShell script to import the users in the CSV file to the destination tenant. (You can click the to download the script.) - **Allow guest access in Teams**. Refer to the following steps to allow guest access to destination Teams: 1. In the destination , click **Users** in the left navigation, and click **Guest access**. 2. Turn on **Guest** **access**. ![Turn on Guest access](/en/fly-migration-process/microsoft-teams-migration-process/images/image9.png "Turn on Guest access")

    6. Create Teams in destination tenant (optional)

    Fly can create Teams in the destination with the default domain of the destination tenant. If you want to create Teams without the default domain of the destination tenant, or you want to migrate to existing Teams, you can create Teams in the destination before the migration.

    *Note: If the destination connection does not have an app profile or the destination Teams already exist, the destination service account and the migration time will be respectively displayed as the sender and the send time of the migrated channel conversation messages in the destination. The source sender and send time of source conversation messages will be migrated as the message content.

    7. Check destination retention policies

    If retention policies are configured for the source data, check to make sure the destination retention policies are the same as the source retention policies. Otherwise, the destination data may be deleted due to different retention policies.

    8. Prepare sensitivity labels in destination (optional)

    If the source tenant does not have sensitivity labels, you can ignore this step.

    If the source tenant has sensitivity labels, and you want to keep the source sensitivity labels applied on Teams/emails/files to the destination, you need to create and publish the sensitivity labels in the destination before the migration. Refer to for details.

    9. Create source and destination connections

    Refer to  to connect Fly to your source and destination Teams. The connection including both the app profile and service account is recommended.

    10. Migration throughput

    In Teams migrations, the job speed depends on the size of SharePoint team sites, the number of conversations, and the size of Group mailboxes.

    SharePoint Site Migration Throughput

    Generally, a reasonable SharePoint site migration speed is about 2 GB/hour/mapping. The number of mappings that run in parallel is automatically allocated based on your purchased subscription. The more subscriptions you purchase, the more mappings you can run in parallel.

    Conversation Migration Throughput

    Refer to the following cases for the Teams migration speed:

    - If the destination connection has an app profile and the destination Teams are newly created during the migration, a reasonable Teams migration speed is 5000 messages/hour/mapping. - If the destination connection does not have an app profile or the destination Teams already exist before the migration, a reasonable Teams migration speed is 1200 messages/hour/mapping.

    The number of mappings that run in parallel is automatically allocated based on your purchased subscription. The more subscriptions you purchase, the more mappings you can run in parallel.

    Mailbox Migration Throughput

    Generally, a reasonable migration speed of the mailbox is 1.5 GB/hour/mapping. The number of mappings runs in parallel is automatically allocated based on your purchased subscription. The more subscriptions you purchase, the more mappings you can run in parallel.

    We can calculate how much content can be migrated with the above infrastructure.

    *Note: As the tenant throttling varies from tenant to tenant, this speed is for reference only. If you want a higher speed, you can migrate the conversations that are sent earlier as HTML files.

    There are many factors which may affect migration performance:

    - The above throughput number is for the full migration. Generally, it may be lower for the incremental migration since Fly needs to spend quite some time checking the migrated items’ status for the incremental migration. - The above results are only ideal values after many tests. The migration speeds of different tenants may be different. We recommend that you estimate the daily throughput in the same way as the results of the pilot job. - If your Planner is particularly large, the overall migration speed may be slowed down.

    11. Prepare mapping files

    Configure Teams mapping files and user mapping files:

    - Examples in the Teams mapping file ![Examples in the Teams mapping file.](/en/fly-migration-process/microsoft-teams-migration-process/images/image10.png "Examples in the Teams mapping file.") - Examples in the user mapping file ![User mapping file](/en/fly-migration-process/microsoft-teams-migration-process/images/image11.png "User mapping file")

    12. Design the migration policy

    A Microsoft Teams migration policy allows you to define the migration scope of Team objects, the destination format of channel conversations, the conflict resolutions, whether to replace source email addresses/meeting links with destination, how to map users, and how to manage the sensitivity labels of files/emails/Teams for Microsoft Teams migrations. Refer to for details.

    By default, Fly will automatically complete the destination Teams, which are newly created during the full migration job. If you want to disable the auto complete, you can configure the AutoCompleteTeams=false customized feature string in the migration policy. After all of the messages are migrated to destination Teams, you can manually complete the destination Teams by running the Complete migration job. Refer to and for details.

    13. Understand when destination users will receive notifications

    In some situations, destination users will receive email notifications when they are added to destination Teams or source objects are migrated to destination users.

    - Will not receive welcome emails if - the destination Team is newly created by Fly during the migration. - the destination is an existing Team, which was created via the Teams app via the **From** **template** or **From** **another team** method. - the destination is an existing Team, which was created from the Teams admin center via the **Add a team** method. - Will receive welcome emails if - the destination is a Microsoft 365 Group without Teams added. (In this case, Fly will automatically enable a Team for the Group during the migration.) - the destination is an existing Team, which was created via the Teams app via the **From** **group** method.

    For more detailed information, refer to Full/Incremental migration Job.

    Full/Incremental migration Job

    The table below shows specific situations when destination users will be notified.

    Notification TypeUser TypeDestination Connection: Service Account Authentication OnlyDestination Connection: App Profile Only (Destination Teams are newly created during the migration)Destination Connection: Service Account Authentication and App Profile(Destination Teams are newly created during the migration)Destination Connection: Service Account Authentication and App Profile(Destination Teams already exist before the migration)
    Team Activity Notification: User mentioned in TeamsInternal UserWill receive notification if you select the Membership option in the migration policy.Will not receive notification if you deselect the Membership option in the migration policy.Will not receive notification.Will not receive notification.Will receive notification if you select the Membership option in the migration policy. Will not receive notification if you deselect the Membership option in the migration policy.
    Team Activity Notification: User mentioned in TeamsGuest UserWill receive notification if you select the Membership option in the migration policy.Will not receive notification if you deselect the Membership option in the migration policy.Will not receive notification.Will not receive notification.Will receive notification if you select the Membership option in the migration policy. Will not receive notification if you deselect the Membership option in the migration policy.
    Team Activity Notification: User added to TeamsInternal UserWill receive notification if you select the Membership option in the migration policy. Will not receive notification if you deselect the Membership option in the migration policy.Will receive notification if you select the Membership option in the migration policy. Will not receive notification if you deselect the Membership option in the migration policy.Will receive notification if you select the Membership option in the migration policy. Will not receive notification if you deselect the Membership option in the migration policy.Will receive notification if you select the Membership option in the migration policy. Will not receive notification if you deselect the Membership option in the migration policy.
    Team Activity Notification: User added to TeamsGuest UserWill receive notification if you select the Membership option in the migration policy. Will not receive notification if you deselect the Membership option in the migration policy.Will receive notification if you select the Membership option in the migration policy. Will not receive notification if you deselect the Membership option in the migration policy.Will receive notification if you select the Membership option in the migration policy. Will not receive notification if you deselect the Membership option in the migration policy.Will receive notification if you select the Membership option in the migration policy. Will not receive notification if you deselect the Membership option in the migration policy.
    Welcome EmailInternal UserIf the destination Teams are newly created by Fly during the migration, Fly will disable the welcome emails and the destination users will not receive any welcome emails when they are added to destination Teams.If the destination Teams already exist before the migration, Fly will not disable the welcome emails for the destination users. You can manually disable welcome emails for them. Refer to Disable welcome emails (optional) for details.If the destination Teams are newly created by Fly during the migration, Fly will disable the welcome emails and the destination users will not receive any welcome emails when they are added to destination Teams.If the destination Teams already exist before the migration, Fly will not disable the welcome emails for the destination users. You can manually disable welcome emails for them. Refer to Disable welcome emails (optional) for details.If the destination Teams are newly created by Fly during the migration, Fly will disable the welcome emails and the destination users will not receive any welcome emails when they are added to destination Teams.If the destination Teams already exist before the migration, Fly will not disable the welcome emails for the destination users. You can manually disable welcome emails for them. Refer to Disable welcome emails (optional) for details.If the destination Teams are newly created by Fly during the migration, Fly will disable the welcome emails and the destination users will not receive any welcome emails when they are added to destination Teams.If the destination Teams already exist before the migration, Fly will not disable the welcome emails for the destination users. You can manually disable welcome emails for them. Refer to Disable welcome emails (optional) for details.
    Welcome EmailGuest UserIf the destination Teams are newly created by Fly during the migration, Fly will disable the welcome emails and the destination users will not receive any welcome emails when they are added to destination Teams.If the destination Teams already exist before the migration, Fly will not disable the welcome emails for the destination users. You can manually disable welcome emails for them. Refer to Disable welcome emails (optional) for details.If the destination Teams are newly created by Fly during the migration, Fly will disable the welcome emails and the destination users will not receive any welcome emails when they are added to destination Teams.If the destination Teams already exist before the migration, Fly will not disable the welcome emails for the destination users. You can manually disable welcome emails for them. Refer to Disable welcome emails (optional) for details.If the destination Teams are newly created by Fly during the migration, Fly will disable the welcome emails and the destination users will not receive any welcome emails when they are added to destination Teams.If the destination Teams already exist before the migration, Fly will not disable the welcome emails for the destination users. You can manually disable welcome emails for them. Refer to Disable welcome emails (optional) for details.If the destination Teams are newly created by Fly during the migration, Fly will disable the welcome emails and the destination users will not receive any welcome emails when they are added to destination Teams.If the destination Teams already exist before the migration, Fly will not disable the welcome emails for the destination users. You can manually disable welcome emails for them. Refer to Disable welcome emails (optional) for details.
    Task Comment EmailInternal UserWill not receive notification.Will not receive notification.Will not receive notification.Will not receive notification.
    Task Comment EmailGuest UserWill receive notification if you select the Membership option in the migration policy. Will not receive notification if you deselect the Membership option in the migration policy.Will receive notification if you select the Membership option in the migration policy. Will not receive notification if you deselect the Membership option in the migration policy.Will receive notification if you select the Membership option in the migration policy. Will not receive notification if you deselect the Membership option in the migration policy.Will receive notification if you select the Membership option in the migration policy. Will not receive notification if you deselect the Membership option in the migration policy.
    Task Assign EmailInternal UserWill receive notification.Will receive notification.Will receive notification.Will receive notification.
    Task Assign EmailGuest UserWill not receive notification.Will not receive notification.Will not receive notification.Will not receive notification.

    Migrate membership job

    The table below shows specific situations when destination users will be notified.

    Notification TypeUser TypeMigrate Membership Job
    Welcome EmailInternal UserIf the destination Teams are newly created by Fly during the migration, Fly will disable the welcome emails and the destination users will not receive any notifications when they are added to destination Teams.If the destination Teams already exist before the migration, Fly will not disable the welcome emails for the destination users. You can manually disable welcome emails for them. Refer to Disable welcome emails (optional) for details.
    Welcome EmailGuest UserWill not receive notification.

    Disable welcome emails (optional)

    Generally, users will receive welcome emails if they are added as members of a Microsoft Team. If the destination Teams are newly created by Fly in the migration, Fly will disable the welcome emails by default to avoid interruption. However, if the destination Teams already exist before the migration, Fly will not disable the welcome emails. You can manually disable the welcome emails.

    *Note: To execute this PowerShell command, the following additional roles are required:

    - Application Impersonation - Mail Recipients

    *Note: Even if you disable the email notification, the tasks’ Assign to users will receive the notification when the tasks are migrated to the destination.

    Refer to the following steps to disable or enable the welcome emails:

    1. Install the Exchange Online PowerShell V3 module to the server where you will run the DisableAndEnableGroupWelcomeEmail.ps1 file. Refer to for details.

    2. Connect the Exchange Online PowerShell V3 module to Exchange Online. Refer to for details

    3. Download the , and extract the ZIP file to a location with a network connection.

    4. In the extracted tool folder, open the Template.csv file, and configure the email addresses of Teams for which you want to disable welcome emails.

    5. Right-click the DisableAndEnableGroupWelcomeEmail.ps1 application file, and select Run with PowerShell.

    6. Enter your credentials, and click OK to open the PowerShell window.

    7. Enter the full path of the CSV file configured in step 4, and press Enter on the keyboard.

    8. To disable the notifications, enter option 1 and press Enter on the keyboard.

      To enable the notifications, enter option 2 and press Enter on the keyboard.

    14. Plan a pilot run

    We recommend you perform a pilot run for the following purposes:

    - Get familiar with the Fly interface and understand the whole migration process. - Discover and resolve any potential issues before production migration. - Understand the throttling situation in case content size is large, and then try to resolve with the destination.