Microsoft Purview | Information Protection: Encryption support for shared mailbox with security group in Outlook

Coming soon to Microsoft Purview | Information Protection: After assigning a mail-enabled security group to a shared mailbox, members of the security group will be able to use Microsoft Outlook for Windows to view and respond to newly generated encrypted mail. Direct user assignment with automapping enabled is no longer required to open encrypted mail in the application

This message is associated with Microsoft 365 Roadmap ID 385345.

When this will happen:

Public Preview: We will begin rolling out late June 2024 and expect to complete by late July 2024.

General Availability: We will begin rolling out in early September and expect to complete by late October.

How this will affect your organization:

For encrypted mail sent to a shared mailbox using Do Not Forward protection or Encrypt-only protection, members of the assigned mail-enabled security group will be able to use Outlook for Windows to view and reply to the encrypted mail. Only mail that is generated after the rollout is completed will be accessible in Outlook for Windows.

Your users must be using Outlook for Windows Version 2402 or higher. There is no change required to your existing user and group assignments to your shared mailbox.

What you need to do to prepare:

See Message encryption FAQs | Microsoft Learn for details on the latest shared mailbox support. Before rollout, we will update this post with revised FAQs.

This rollout will happen automatically by the specified date with no admin action required before the rollout. You may want to notify your users about this change and update any relevant documentation as appropriate.