Can mailboxes be added to more than one mail sync collection?
If a mailbox is added to a second mail sync collection it is automatically removed from the previous collection first. A mailbox can only exist in a single collection plus the disabled "All mailboxes" collection which is created automatically for every server pair.
This does not apply to collections populated using distribution lists - mailboxes need to be manually removed from the DL to avoid becoming part of multiple collections.
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