I did a lot of research to find an answer to this question, but without luck so far.
The situation is as follows:
- Exchange Online with EO Plan 1, E3, and E5 licenses
- No modifications were done to Microsoft's default MDM Policy
- Enabled Personal Archive for each Mailbox in EAC | Recipients | Mailboxes
The "Default MDM Policy" has a Retention Tag named "Default 2 year move to archive". That means each Item > 2 years old will be automatically moved to the In-Place Archive by the Managed Folder Assistant.
I also know that all Retention Tags of type "new tag applied automatically to the entire mailbox (default)" will apply to a user's mailbox and his In-Place Archive.
Means, if I would add another "default"-Tag to the Default MDM Policy and set it to "Permanently delete" after 7 years, all Items > 7 years old (either in the User's mailbox or his In-Place Archive) would be deleted.
But what happens to items in In-Place Archives, when I only have the "Default 2-year move to archive" Tag? I mean, when I do not modify the "Default MDM Policy".
Will Exchange keep In-Place Archive Items forever, or am I missing something? Also, I know I could have some kind of Hold on some/all items, but I have it not configured.