A few months back, we announced the general availability of the new Exchange admin center (EAC). The new EAC offers a faster, more secure, and more intelligent modern admin experience than the classi...
Updated Sep 13, 2021
Version 2.0
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Roberto_Yglesias , the functionality of Retention Policies in the Compliance Center is completely different than MRM policies. MRM policies provide a way to move data to online archive, while Compliance Center retention policies are solely about proactively retaining or deleting data from mailboxes. In fact, the published https://docs.microsoft.com/en-us/exchange/security-and-compliance/messaging-records-management/retention-tags-and-policies states "You should continue using messaging records management to move messages to archive mailboxes".
This isn't simply a lack of feature parity between the 2 offerings, but rather they are 2 completely different technologies used for 2 completely different functions. Great to hear MRM management functionality will be migrated to the new EAC as this is critical function that is widely used throughout organizations.