Corrupt OST

Posted on 2005-04-18
Last Modified: 2010-08-26

We are using Outlook 2003 w/ Exchange 2003 in cached mode on an XP pro machine. One user gets an error everytime they launch Outlook: "data file for username was not closed properly"  and then it proceeds to scan the mail box. This can take 10 minutes [OST is 3+G]

I have run the inbox repair/ reinstalled Outlook

I have searched everywhere for a solution to this problem and although I have seen the problem described, I have not seen the fix/solution posted yet.

Any input would be greatly appreciated
Question by:pmahon2005
    LVL 21

    Accepted Solution

    You said, you're using the cached mode, so every mail is still stored on the server.

    The following is not really a solution but it should help...
    Delete the OST file or rename it and the next time the user starts Outlook an new file will be created and Outlook will download the mails into the new file.

    LVL 6

    Expert Comment

    Was the OST file originally created in Outlook 2000 or before?  If so, you got a problem, you have to trunicate it to below 2 gb.  Let me know if this is the case, I will forward you the file.

    Author Comment

    The OST file has been created recently by deleting the old profiles and creating a new one. This XP computer came shipped with Office 2003.

    However, this user may be using Citrix with Outlook 2000 which, based on what your saying, may be the root of the problem
    LVL 21

    Expert Comment

    Outlook 2000 doesn't support the exchange cache-mode and therefore should not complain about ost-files. As far as I know these files are only generated with activated exchange cache-mode...

    Author Comment

    Could switching between Outlook 2000 (from Citrix) and Outlook 2003 (on company PC) somehow corrupt the mail box and cause this error message at startup?

    LVL 6

    Assisted Solution

    Yes, I think the office 2000/2002 2 gigabyte limit may very well be your problem.  Not an easy fix, because you will h ave to trunicate your data.  I would make a backup of his OST, and then try the below link.  If it works, great, then you know it was the problem, if it does'nt , then you just discard the trunicated OST, and continue to troubleshoot with the orginal.  I needed to restore a OST once, and ran into this exact problem, only I did not recieve the error message microsoft says you may get.  I feel this is more than likley your issue.

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