Public Folders that contain more than 4.3 gigabytes (GB) of content may report a value of zero in the Exchange Server Administrator program under Public Folder Resources.
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This problem can occur because the data is calculated in the information store as a MAPI property called PR_MESSAGE_SIZE. This variable is defined as an unsigned long variable, which only holds 4.3 GB of content.
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To resolve this problem, upgrade to Microsoft Exchange 2000 Server. In Exchange 2000, the PR_MESSAGE_SIZE variable has been changed to PR_MESSAGE_SIZE_EXTENDED, which is an 8-byte integer that holds as much as 16 terabytes of content.
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Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.
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The PR_MESSAGE_SIZE variable cannot be changed because the change can potentially destabilize the information store.
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