This article is intended for administrators and ITPros. This article is part of a larger series of articles about Office 365 Message Encryption. For information on how the new capabilities work, see Office 365 Message Encryption (OME). The two can coexist in your organization.
Unique characteristics of deploying into GCC High are also outlined. The new capabilities are a merger and newer version of both OME and Information Rights Management (IRM). The rest of this article compares legacy Office 365 Message Encryption (OME) to the new OME capabilities and Office 365 Advanced Message Encryption. See 'Overview of AD RMS deprecation in Exchange Online' in this article for information. Organizations that have deployed into the GCC Moderate environment are also affected.
If you've deployed a hybrid environment where your Exchange mailboxes are online and you're using IRM with Active Directory RMS on-premises, you'll need to migrate to Azure. On February 28, 2021, Microsoft deprecated support for AD RMS in Exchange Online.
