"The connection to the server “imap-mail.outlook.com” on port 993 timed out."

On the current attempt, I haven't yet received this error but after approximately 15 minutes (on a very high speed connection) only my 'Junk' folder has synced (all other folders are present, but empty).

Please could you advise on what might be wrong here? I'm using a '@hotmail.com' email address, if that affects matters at all.