Is this an account from your ISP? If yes, see if you have reached the limit
on the mailbox storage. Check their webmail if they have that option.

--
Milly Staples [MVP - Outlook]

Post all replies to the group to keep the discussion intact. All
unsolicited mail sent to my personal account will be deleted without
reading.

After furious head scratching, Cosmo T asked:

| I cannot receive email messages in 1 of 3 email addresses in MS
| Outlook. The error message says the ERR box is locked. How do I
| correct the problem?
| I send out messages from this address but cannot receive in MS
| Outlook.