[Error Code] 0x8004011d [Relevant Links] Permissions issue: Mail Server Requirements MAPI issue: GAMME Admin Guide [Explanation] 
The Exchange administrator account used does not have sufficient permissions to open end-user mailboxes. Occasionally, there is a problem with legacy administrator accounts. Please create a new administrator user on Exchange and give the account full mailbox access (MBA) for all end-user accounts. Then use this account for migration. You can leave the original administrator account as is and delete the migration administrator account after the migration is complete. If migrating from PST files, ensure that the PST is not password-protected. This error code can also occur if your Exchange Server exceeded the 32 MAPI session limit during a migration. You can resolve the issue by configuring GAMME or your Exchange Server.