Error 0x8004060c The message store has reached it's maximum size

[bdoub1eu]

One of our users is getting this message in Outlook 2003 when doing a send/receive. In the mailbox store on the Exchange 2003 server, there is NO limit set. In the mailbox for this user, it says to use the mailbox store defaults.

Don't think it's an issue with the .ost...I thought the ost in 2003 could be up to 20TB's according to M$.

Any ideas? There shouldn't be a limit on the mailboxes...

 

[bdoub1eu]

If the limits on the mailbox store are left blank, do they default to a certain size?