Orphaned .ost file


  • Anyway to recover an ost file when the original server is gone and the computer with the "orphaned" ost is now joined to a new domain?  Original server was W2K3 SP2 w/ E2K3 SP2.


    My thoughts are to setup another "mock" server identical to the original server, rejoin this computer to the old domain and then try to deal with the security mismatch of the ost to the server?


    There is enough information to rebuild the server exactly as it was before (including passwords).




    Thank You,



    Tuesday, September 11, 2007 2:44 AM

All replies

  • You cannot connect an orphaned ost file to a new mailbox.

    there is 3 things that must match, MAPI profile on client machine, ost file and mailbox. if you change any of those 3 the others will fail.


    What you can do if you have the same MAPI profile configured, is to open the ost file while not bing connected to Exchange (offline) and then export data to a pst file. later you can import data from that pst file


    • Proposed as answer by Rich Dolan Wednesday, February 03, 2016 5:53 PM
    Tuesday, September 11, 2007 9:49 PM
  • How would I go back to the previous profile since this computer has joined a new domain?  Going back to the other profile would require authentication to the previous server (I think) which has crashed. (no backup of course)

    Wednesday, September 12, 2007 11:48 PM
  • If you cant use the old profile, then  you're out of luck


    Thursday, September 13, 2007 5:23 AM
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    Monday, July 11, 2011 5:39 AM
  • That sounds like a quite of bit work to rebuild domain and server for one OST file, I would suggest third party tool to export OST to PST.  Google for many tools that do this.

    MVP Exchange Server
    Saturday, August 06, 2011 11:40 PM
  • The best way to do so is to convert orphaned OST file to PST format. One can download a perfect OST to PST tool from
    • Proposed as answer by andrew russelBanned Thursday, July 19, 2012 6:21 AM
    • Edited by Inkrut Wednesday, December 04, 2013 6:59 AM
    Monday, June 18, 2012 9:48 AM
  • You can re access your orphaned OST file by converting it to PST file using tools like Kernel for OST to PST Conversion Tool. Go to to know more about orphaned OST recovery and download the demo application.

    Tuesday, December 10, 2013 7:05 AM
  • There are many tool that can easily recover and convert orphaned OST file in PST and other popular file formats.

    Conversion options: OST to PST, MBOX, PDF, EML, EMLX, MSG, HTML, MHTML, XPS, RTF, and DOC

    Also, recover heavily corrupted, highly encrypted and password-protected OST files.

    For more information, visit:

    Hope, this information will be helpful for you to regain the access of orphaned OST files.

    • Edited by Comm ander Saturday, October 01, 2016 10:34 AM
    Saturday, October 01, 2016 10:33 AM