Convert Outlook.pst 2010 back to Outlook.pst 2007


  • I have used the Microsoft Office 2010 Beta for a month or so and was very encouraged by the look and feel of the program, until I started losing mail into Outlook 2010 that is. I soon lost confidence in Outlook 2010 and decided to re-load Office 2007. Everything works fine and the Outlook.pst file works fine in Outlook 2007 except that I get a warning on startup of Outlook saying that 'The mail profile @outlook' was created with a newer version of Outlook'. Does anyone know of a way to convert the Outlook.pst file to operate without the warning?
    Monday, February 08, 2010 7:54 PM

All replies

  • The problem isn't the PST, its the profile. Try closing outlook and restarting it using the /cleanprofile switch.  If that fails, you'll need to make a new profile.

    see if you need help using switches.

    Diane Poremsky [MVP - Outlook]
    Outlook Tips:
    Outlook & Exchange Solutions Center:
    Monday, February 08, 2010 9:23 PM
  • Thanks Diane, I tried /cleanprofile switch and it didn't work so just renewed the profile and restored my *.pst files. Thanks again....
    Thursday, February 11, 2010 12:06 PM
  • I have the same issue:

    Sorry, but this is simply not a good solution as it is a pain in the butt for someone such as me who has several different email accounts and huge archive/outlook .pst files. I spent a lot of time configuring my profile and all of the tiny little details over a long period of time. Creating a new profile is much more painful and potentially problematic than the error message popup. Copying or editing the profile also does not work.

    There MUST be a way to edit the registry or remove/replace some files or repair MS Office to get rid of the message without having to create a whole new profile. Please provide the technical solution or pass this up the food chain to someone else or some other forum.

    Thanks in advance

    Thursday, August 12, 2010 3:05 AM

  • You could try the cleanprofile switch in Outlook 2007 but i don't know if it will help. If you have system restore point for before you installed Office 2010, you could roll back to it and export the windows messaging subsystem key then restore back to a current point and run the reg. This preserves any other changes you made since installing office and brings back the old profile.

    Another option that might work - remove the accounts from the current profile and add them back. You won't lose as many customizations this way. I *think* (but am not sure) that the changes were only to the accounts, not extra pst files.

    FWIW, You should never use Betas or Trials if you aren't willing to redo things.

    Diane Poremsky [MVP - Outlook]
    Outlook Daily Tips | Outlook & Exchange Solutions Center
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    Thursday, August 12, 2010 2:32 PM
  • I had same issue, Get read of both outlook and clean registery . then load outlook 2007 and import the data file into it. I think the is an issue in registry and way files are intracting.
    Sunday, December 04, 2011 9:25 AM
  • I had same issue, Get read of both outlook and clean registery . then load outlook 2007 and import the data file into it. I think the is an issue in registry and way files are intracting.

    No, the issue is that you had was having 2 versions of Outlook installed at the same time. This isn't supported and shouldn't be possible either with a proper installation. Most likely your installation of Office 2007 was damaged in such a way that the installer of Office 2010 did not "see" Outlook 2007 and therefor did not remove it either.

    In such cases you indeed need to remove both versions of Office. If uninstall fails, use the FixIt solution matching your version of Office from this guide;

    Note that importing your data really isn't needed either as you can reconnect to your pst-file directly via;
    File-> Open-> Open Outlook Data File

    For more information, also see;

    Robert Sparnaaij [MVP-Outlook]
    Outlook guides and more:
    Outlook Quick Tips:
    Sunday, December 04, 2011 6:06 PM
  • Yes I tried it all
    Thursday, December 22, 2011 2:33 AM
  • I did exactly and it work,

    Thanks roady

    • Proposed as answer by syamak Thursday, December 22, 2011 2:35 AM
    Thursday, December 22, 2011 2:35 AM
  • i think both outlook creates unicode pst file format and you can easily open outlook 2010 pst file into outlook 2007 check this
    Wednesday, July 26, 2017 5:42 PM