I have a user with a mailbox that just hit 20G. He is getting messages that he has exceeded the limit and can't access or move new messages. We don't have quotas on mailboxes. Is 20G the limit? --Patrick --Patrick

No there is no hard limit, it's only the limit based on your disk size or the theoretically limit of the database size 16TB. Are you sure there is no quota at the mailbox level or the database level? What version of Exchange?James Chong MCITP | EA | EMA; MCSE | M+, S+ Security+, Project+, ITIL msexchangetips.blogspot.com

I just looked again. There are no limits set for this mailstore. This user is on Exch Enterprise 2007. He runs in cached mode. Is this a limit on the OST file? There is plenty of local disk space. This would be our largest mailbox. --Patrick --Patrick

You are right Patrick. There are size limits on OST-files. How to configure the size limit for both (.pst) and (.ost) files in Outlook 2010, Outlook 2007, and in Outlook 2003 http://support.microsoft.com/kb/832925Martina Miskovic

Yes you've hit the ost limit of 20gb for outlook 2007. The default is 20gb for outlook 2007 but can bump up to 50gb. How to configure the size limit for both (.pst) and (.ost) files in Outlook 2010, Outlook 2007, and in Outlook 2003 http://support.microsoft.com/kb/832925 James Chong MCITP | EA | EMA; MCSE | M+, S+ Security+, Project+, ITIL msexchangetips.blogspot.com

Thanks. We're bringing the user to Office 2010 now. He should have been already. That should take care of this. --Patrick --Patrick