Error: Error occured while performing ExecuteTask
This error can be viewed in the mailbox error log and the mailbox will fail to start migrating.
This occurs if an incorrect URL has been entered for the source or destination email server.
An incorrect URL is normally spotted during the verify process but if this has been completed and then the URL is edited incorrectly afterwards then you will see this error and the project will fail to start.
Please check and correct the URL's and then start the project again.