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Q261891: XADM: Public Folder Size Displayed Incorr. If Larger Than 4.3 GB

Article: Q261891
Product(s): Microsoft Exchange
Version(s): 4.0,5.0,5.5
Operating System(s): 
Keyword(s): exc4 exc5 exc55
Last Modified: 16-NOV-2000

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The information in this article applies to:

- Microsoft Exchange Server, versions 4.0, 5.0, 5.5 
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SYMPTOMS
========

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.

CAUSE
=====

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.

RESOLUTION
==========

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.

STATUS
======

Microsoft has confirmed this to be a problem in the Microsoft products that are
listed at the beginning of this article.

MORE INFORMATION
================

The PR_MESSAGE_SIZE variable cannot be changed because the change can
potentially destabilize the information store.

Additional query words:

======================================================================
Keywords          : exc4 exc5 exc55 
Technology        : kbExchangeSearch kbExchange500 kbExchange550 kbExchange400 kbZNotKeyword2
Version           : :4.0,5.0,5.5
Issue type        : kbbug
Solution Type     : kbnofix

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