WIN 2008 r2
Exchange 2010 GRT
We cam across a case that While restoring mailboxes via Recovery Storage Group, there was limitation that the old user must exists in any state/case because it matches Mailbox GUID to restore contents. But in case of refreshing mailboxes, GUID gets changed and then we are unable to restore mailboxes via RSG
According to the Microsoft Technote, the Recovery Storage Group can be used to recover the mailboxes when the mailboxes in the databases remains intact and unchanged in Active Directory. In case of recreating / refreshing the mailboxes in the exchange database the GUID gets changed and we cannot recover it from the RSG with different GUID, and you need to change the GUID manually if you want to recover it from the RSG.
The RSG is designed for mailbox database recovery under the following conditions and scenarios:
There are two parameter sets for the Restore-Mailbox cmdlet: