- The Exchange administrator account doesn’t have sufficient permissions to open user mailboxes.
- This error code can also occur if your Exchange server exceeds the MAPI session limit during a migration.
Step 1: Create A New Administrator User
Create a new administrator user on Exchange and give the account full mailbox access for all user accounts.
Step 2: Use New Account For Migration
Then, use the new account for the migration. You can delete the new administrator account after the migration is complete.
Step 3: Ensure File Not Password Protected
If you’re using PST files for the migration, ensure the files aren’t password protected.
Step 4: Adding Configurations To GSMME
You can resolve the issue (2nd cause) by adding configurations to GSMME or your Exchange server. For details, refer the GSMME Admin Guide.