This article was previously published under Q271465
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IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:
256986 Description of the Microsoft Windows Registry
After you perform a file-level backup of the Exchange Installable File System (IFS) drive, which is drive M by default on Exchange 2000 servers, MAPI-based e-mail clients (such as Microsoft Outlook 2000 and Microsoft Outlook 98) can no longer access attachments. When you view a message that contains an attachment, the attachment appears in the following format in the body of the message:
If you click the file link, you receive the following error message in Microsoft Internet Explorer:
Invalid Syntax Error - Microsoft Internet Explorer
The page cannot be displayed
Open the 1-0000000097FFCB9E7D914942A56CCE3B1EF57AAF07000EB5EB2DDD5BAE43814DCD887A3C0AE7000000001C740000ECFEDB1958A3E94C9887C2A271C77C020000000073510000 home page, and then look for links to the information you want.
This problem occurs when backup software resets the archive bit, causing the IFS to affect the attachment in such a way that it prevents access to it by MAPI clients. The full and incremental backup modes mark files as backed up by using the archive bit; however, the differential back up mode does not use the archive bit.
This problem was first fixed in SP1 for Exchange. You can download SP1 from: