Exchange Online Mailbox Retention

Question

To utilize EXO for SEC Regulation and Purview eDiscovery.   I think we need to have some kind of 7 years retention.

1. What is the best way to accomplish this?  MRM, Compliance Policy, Preservation lock, some kind hold policy, litigation hold ?   So deleted items are not deleted and Primary mailbox will expand to Archive up to 1.5 TB.  EX: under Data lifecycle management, create a 7 years retention policy for EXO, and other services.  Would this be sufficient?
2. For mailbox reaching 1.5TB with retention in place, how would I move mailbox data to secondary mailbox and allow users to access both.
3. If a leaver mailbox is delete after 30 days, will the retention keep the data for purview searches?

Answer 1

Hi,@Jimhex2024

Thanks for posting your question in the Microsoft Q&A forum.

Based on your description, I will answer your questions in turn:

1.If you want EXO content to be retained for 7 years, it is recommended that you create a new MRM policy in EXO.You can refer to this link for details:https://learn.microsoft.com/en-us/exchange/security-and-compliance/messaging-records-management/create-a-retention-policy

2.Exchange Online Archiving provides auto-expanding archiving for additional storage space in archive mailboxes up to 1.5 TB. Once the primary mailbox reaches its limit, users can still archive older messages to this auto-expandable space and access the data seamlessly.

3.When an employee leaves and their mailbox is deleted after 30 days, a retention policy that includes deletion protection will ensure that the data is preserved. The information will be retained for the duration specified in the policy, and Purview eDiscovery can search through this retained data even if the mailbox is not active.

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