Script Download: PSTChecker.zip
http://gallery.technet.microsoft.com/scriptcenter/Display-a-notification-13dbfa92

This VBA sample illustrates how to prompt a warning message when Outlook is starting if the PST file size reaches the limit. It can be run on Outlook 2007 and 2010.

ITPros find a lot of issues caused by the large PST file. This VBA can help ITPros to reduce their workload and prevent potential Outlook issues.

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You can find more All-In-One Script Framework script samples at http://aka.ms/onescriptingallery