If you are getting this eror while migrating your mailbox to office 365 or Live Edu in the cloud then one of the following could solve your issue.
- Verify that the IMAP service is running on the IMAP server.
- Verify that the IMAP server is available and that you can connect to it.
Tip Use an IMAP client to connect to the IMAP server. Use the same connection settings that you used when you ran the migration batch. Or use the PING command to test whether you can communicate with the IMAP server.