You receive a 0x00040820 error message when you try to synchronize your Microsoft Exchange Server mailbox to an .ost file

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Article ID: 306076 - View products that this article applies to.
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If you attempt to synchronize your Microsoft Exchange Server mailbox to an offline folder (.ost) file that has reached the 1.82 gigabyte (GB) size limit, you may receive the following error message:
Task ‘Microsoft Exchange Server’ reported error (0x00040820): Errors in background synchronization. In most cases, further information is available in a synchronization log in the Deleted items folder.
However, the synchronization log does not exist in the Deleted items folder in the Exchange Server mailbox or in the Deleted items folder in the .ost file.


This behavior occurs because Outlook 2002 limits the .ost file size to approximately 1.82 GB.


Use one of the following methods to work around this behavior:
  • Permanently delete all unwanted messages from any server based e-mail folders that are set to be synchronized with the .ost file. Press Shift + Del to permanently delete data in Outlook 2002. -or-

  • Move data from any synchronized folder to a non-synchronized folder on the Exchange Server. -or-

  • Move data from a synchronized folder to a personal folders (.pst) file, and permanently delete the data from the synchronized folder.


After you install the Microsoft Office XP Service Pack 1 (SP-1), you will receive a warning when you approach the 2 gigabyte (GB) size limit of personal folder and offline store files.

For additional information about how to obtain the latest Office XP Service Pack, click the article number below to view the article in the Microsoft Knowledge Base:
307841 OFFXP: How to Obtain the Latest Office XP Service Pack


Article ID: 306076 - Last Review: July 28, 2006 - Revision: 1.4
  • Microsoft Outlook 2002 Standard Edition
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