Migration Agent for Exchange (MAgE) shows the following error in the log file:
To troubleshoot the issue:
1) Restart the MAGE in order to get its version in the log file.
2) If the log shows the version lower that the one mentioned in the MigrationManager_8.13_Update_[Update_date]EX.htm document supplied along with the hotfix, repair the MAGE by selecting MAGE host in the Agent Management view (in the central pane) and pointing to Repair link in the right and selecting UnifiedMailSync.
3) If the log file shows the correct version number, please refer to
for further troubleshooting steps.