Configured a hybrid configuration using Exchange2010, during a move to Office365 it fails:
Downloaded report user:
Failed to find a principal in the target forest that corresponds to the following source forest principal values: SID: S-1-5-21-409026243-1077712498-396310352-28217; ObjectGuid: c687e8c5-5f63-4855-8069-b7c46ef24377;
Skipped item details:
CorruptMailboxSecurityDescriptor
The error message above appears 7 times, it has something to do with the groups that are not migrated. The mailbox move itself works, it's able to copy the content, folder hierarchy, convert the user and so on. The only problem seems to be that it can find the groups in the target forest (office 365). I've checked it and the groups are there. A few groups are:
Exchange trusted subsystem group (Inherited)
Organization Management group (Inherited)
CAS...