I've just moved to Snow Leopard and have found that my main Mail IMAP account is now locking the server mailbox. This means I can't access the mailbox via Pop from any other machine (such as at home) and the webmail interface will only let me read but not delete mails. I've checked via Mail Preferences that the account is set to Manual Updates (as was its predecessor, when it worked). I assume this setting is just not working as I can see the account is still reading mail automatically. I thought of deleting the account and setting it up again but worry that the warning message about losing all mail associated with this account would mean all my local folders would be zapped. So my temporary fix is to deactivate the account and set up a POP version instead. Any one else have this problem? Anyone know how to solve it?