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MC373880 – Updated June 14, 2022: At the beginning of June, Microsoft attempted to migrate all entries on the Safe Links Block List to the Tenant Allow/Block List. Entries that were successfully migrated do not require any additional action. Entries that were unable to be migrated will require manual intervention. In the coming weeks tenants will be able to review and take action on the entries that were unable to be migrated.
Note: Any entry migrated from the Safe Links Block List to the Tenant Allow/Block List will adopt the behavior of TABL. This means that any message with the URL present will be moved to Quarantine. If deleting an already migrated entry from TABL, it needs to be removed from BlockURLS to avoid migration.
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As a reminder beginning in June tenants will no longer have the ability to add to the Safe Links Block List in the Global Setting menu. Then Microsoft will attempt to migrate the Safe Links Block List to the Tenant Allow Block List (TABL) on behalf of the organization. Any entries that are unable to be successfully migrated, they will be marked as such in the Block List and organizations will have the ability to take action as needed beginning in July.
Another update will be sent closer to July as a reminder for tenants to review the migration status of the Block List. Beginning in June organizations will no longer have the ability to add to the Safe Links Block List in the Global Setting menu. Following this, Microsoft will attempt to migrate the Safe Links Block List to the Tenant Allow Block List (TABL) on behalf of the organization. For any entries that Microsoft is unable to migrate, they will be marked as such in the Block List and organizations will have the ability to take action as needed.
When this will happen:
How this will affect your organization:
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Organizations who are utilizing the Safe Links Block List will need to review the list to ensure all entries were migrated successfully. Any entries that are unable to be migrated will be marked as such and organizations will have the ability to resolve that entry, at which point migration will run again.
Organizations will use the Tenant Allow Block List to manage URL/Domain blocks moving forward.
What you need to do to prepare:
In June an update to this Message center post will be sent notifying organizations that the first migration has been completed and they will need to review their Safe Links Block Lists for potential actions.
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