Microsoft KB Archive/817957

= The e-mail messages that are stored in an Offline Folder file are larger than the e-mail messages that are stored on an Exchange server =

Article ID: 817957

Article Last Modified on 2/1/2007

-

APPLIES TO


 * Microsoft Office Outlook 2007
 * Microsoft Office Outlook 2003

-



SYMPTOMS
When you view e-mail messages that POP3 users sent to your Microsoft Exchange Server e-mail account in Microsoft Outlook, you may find that the sizes of the message are reported to be different, depending on whether you are online or offline. The messages that are stored in an Offline Folder file (.ost) are reported as being much larger than the same e-mail messages that are stored on an Exchange server.



CAUSE
This problem occurs because the message stores that are used for online (.mdb) and offline (.ost) files use different properties and attributes depending on where the messages are located. Differences in the Exchange .mdb and Outlook .ost database structure may cause the observed difference in message, folder, or mailbox size.



MORE INFORMATION
When you compare the message size of your .ost file and the online data, you may notice up to a 60% difference in message sizes because of this issue.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.

Additional query words: OL2003 OL2007

Keywords: kbstore kbprb KB817957

-

[mailto:TECHNET@MICROSOFT.COM Send feedback to Microsoft]

© Microsoft Corporation. All rights reserved.