You may receive duplicate Out of Office messages in Outlook 2003 after your mailbox is migrated to Exchange Server 2007

Your mailbox is migrated from Microsoft Exchange 2000 Server or from Microsoft Exchange Server 2003 to Microsoft Exchange Server 2007. After this occurs, you may receive duplicate Out of Office messages.

This issue occurs when you use Microsoft Office Outlook 2003 as the e-mail client.

This issue occurs because Outlook 2003 changes the PR_OOF_STATE property or the LegacyReplyTemplate property before the Exchange 2007 Out of Office Assistant can process the change. Because this change is never processed, the client produces a duplicate Out of Office message.

To resolve this issue, install Microsoft Exchange Server 2007 Service Pack 1.

For more information about Exchange Server 2007 Service Pack 1, click the following article number to view the article in the Microsoft Knowledge Base:

To work around this issue, use one of the following methods:

• Upgrade to Microsoft Office Outlook 2007.
• Use Microsoft Office Outlook Web Access 2007 to modify the Out of Office message.