This is a three-part question but let's set the stage. Exchange 2013 in hybrid with O365.
1. Is it possible to have a mailbox moved into O365, but keep the Personal Archive homed on-premises?
2. If so, which retention rules take precedence (I assume O365 set ones would)?
3. Would an E1 license suffice, or would we need some separate Exchange CAL to cover the on-premises archive mailbox?
Thanks in advance!
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The only supported archive split scenario is a primary mailbox on-premises and an archive mailbox in Exchange Online.
Please read this article https://support.microsoft.com/en-us/help/2757430/archive-mailbox-issues-for-a-mailbox-that-s-migrate...
Thank you, that puts things in black and white -- and in an awkward position.
This has been like this since Exchange 2010 with Office 365 in Exchange 2010 and not have been changed.
Why you need Archive On-Premises if you have a lot of Gb's in Office 365 ?
Ok, many thanks for the feedback about the reason.
You can have a workaround for your restriction. Create separate mailboxes and give permission to the user.
In that case you could need more licenses, but keep all data in Exchange environment.