I'm running Outlook 2007 on Windows 7.

I'd like to change the OST data file that a Windows/Outlook email profile points to. I've attempt to change it as follows:

  • Go in to the "Mail" Control Panel applet
  • Click the "Data Files..." button
  • Double-click the particular email account
  • Click the "Advanced" tab
  • Click the "Offline Folder File Settings..." button

The resulting dialog box has the "File:" textbox and the "Browse" button disabled. I've searched the registry for a match (so I could possibly change it there) but found nothing.

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  • Why do you want to do this? You can only have one OST file per profile anyway (since an OST is a cache of an Exchange account), and presumably your local IT department is responsible for making backups. – Stephen Jennings Feb 28 '10 at 9:47

I guess you can't move the pst/ost file through the mail settings appelet - you could just copy the file to the new location in explorer and then:

  1. Go in to the "Mail" Control Panel applet
  2. Click the "Data Files..." button
  3. use the 'add' button to browse for the copied file
  4. set the copied file as default ost file
  5. remove the 'old location' ost file

between step 4 and 5 a dialogue requesting to start outlook once may pop up, in that case just do that and remove the old file afterwards

  • @Gero - great point here! In fact it's so straight forwarded that I'm irritated with myself for not thinking of it! I'm going to give it a try. – Howiecamp Dec 29 '09 at 17:53
  • -1. Didn't work for me. Outlook recreates the old OST, and attempts to convert the newly relocated OST to PST. – DuckMaestro Apr 12 '12 at 18:39
  • PST and OST behave differently. For OST, you need to delete the Exchange account from your profile and set it up again, specifying the path to the OST file in the process (if the OST doesn’t exist, it will get created). The OST file apparently cannot be changed on an existing account configuration. – user149408 Aug 2 '17 at 9:54

If you want to do this to move the file, maybe to a different partition because of space constraints, then Gero's step by step should work.

If you are concerned (or know) your OST is corrupt or simply don't want to have to move it first, you could turn off cached exchange mode altogether, run Outlook and close again, make sure the OST is deleted (or backed up then deleted if you really want to).

Now turn cached mode back on and tell it a new location for a new OST (which it will have to build from scratch).

Hope this helps


If you can't alter path/file: Diable offline use, then re-enable it and you can browse to new location

  • 1
    Isn't this essentially the same as @AdamV's answer from 2010? – Ƭᴇcʜιᴇ007 Nov 21 '12 at 18:33

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