I keep getting a message in outlook saying: Character not allowed in mailbox name: '.'    It pops up every few minutes and i can't seem to resolve it, and it is getting really disruptive. It is linked to an IMAP email account i have with my old university set to download into outlook. Does anyone know how i can resolve this?
I keep receiving this error message from Outlook:

Client tried to access nonexistent namespace. (Mailbox name should probably be prefixed with: INBOX.)

Have no idea about what to do