I'm trying to recover some older mailboxes from our old server. I was able to mount the store using exchange 2007 RSG. I can see the mailboxes fine, but if I try to merge them to existing mailboxes it fails as the GUID don't match. Is there a way to exmerge these out as .pst then import the information I need ? Or is there another way of recovering the mailboxes using the RSG merge feature ?