That's a limit in the Microsoft email clients.
No fix is planned.
I work in a small office where we are having intermittent problems with Outlook 2000. We have 2 PCs running Windows XP Home Ed Vers 2002 (one SP2 and one SP1).
We have MS Office 2000 and use Outlook for our email. We send and receive a lot of email and a lot of pdf attachments. When our "Personal Folders.pst" gets around 2 MB in size, we start having the problems. Outlook will be open and working fine and then all of a sudden it will stop responding or we'll try to create a new email and get an error message that basicly says "Outlook cannot locate the Personal Folders, run the Inbox Repair Tool." We run the tool which takes a long time and usually it works, and we go in and delete a lot of emails, but the the problem reoccurs every few hours. A few times, it was not able to repair and we lost all of our emails, address book and tasks list.
Has anyone seen this problem before? We try to clean our our mailboxes, but some email we want to be able to save. Do you think upgrading to Office 2003 would help?