Exchange 2007 SP1 with Rollup patches – size limit

I noticed that on I had a  limit on mailboxes, even though the DB limits were set to none and individually the mailbox limits were all un-ticked.

and both complained, although OWA was nice enough to let me know the exact nature of the problem "your mailbox has exceeded.....|, Outlook was a bit more cryptic.

I'm going to see if this is a known and post back.