ASKER
Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.
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The info you're looking for can be found in a Microsoft Support Doc here:
How to configure the size limit for both (.pst) and (.ost) files in Outlook
Hope that's helpful.
Regards, Andrew