How can you Change the Location of OST File in Outlook?

Sandeep Saxena
Sandeep Saxena | Updated On - 30 Nov 2021 |

Read time 5 min

Offline Outlook Data File (OST) in Outlook facilitates offline working with Exchange and IMAP accounts. Depending on the version of Outlook and Windows, these files are saved in a pre-defined location. When you configure a new Exchange/IMAP profile in Outlook, an OST file is created in this default location. OST files are profile-specific and cannot be accessed without the original profile. If you find any issue with OST files like corruption, inaccessibility, or damages, you can simply delete or move the OST file and let Outlook rebuild the same without errors. However, it’s not recommended and not required to change the default location of the OST file. But if you think you can save some storage space by relocating the OST file, you can do it.

The location of offline Outlook Data File (OST)

When you are using Outlook with an Exchange account, your mailbox and other data reside on the Exchange Server. But enabling the Cached Exchange Mode helps you work even when you are not connected to Exchange. It’s offline Outlook Data (OST) file, a local copy of your Exchange mailbox, that helps you use the mailbox even you are offline. The default locations of the OST file are:

  • drive:\Users\\AppData\Local\Microsoft\Outlook
  • drive:\Documents and Settings\\Local Settings\Application Data\Microsoft\Outlook.

Changing the Default Location of the OST File

There are workarounds that can help you change the location of the OST file in the right way.

  • Create a new Outlook Profile and move the existing OST file to a new location
  • Disable the Cached Exchange mode and configure a new location for the OST

We will discuss both workarounds to change the location of OST files in a more detailed manner.

Method 1: Create a New Outlook Profile and Move Existing OST file to a New Location

This method involves creating a new Outlook profile and configuring a new location for the existing OST. Follow the given instructions to perform the operation.

  1. Locate the existing OST and copy and paste it to the new location.
  2. Launch Control Panel and select the Mail option.
  3. As soon as you click on the Mail option, it will prompt the Mail Setup dialog box.
  4. In the Mail dialog, click on the Show Profiles… button.
  5. Then, in the Mail dialog box, click the Add button.
  6. Enter a new Profile name and click OK.
  7. In the next window, enter the credentials of your email account with which you want to create a new Outlook profile. Then, click Next.
  8. Once Outlook finishes configuring your new email account, check the Change account settings checkbox and click Next.
  9. In the next windows i.e., Server Settings, click on the More Settings button located at the bottom left corner of the interface.
  10. Go to the Advanced tab and click on Outlook Data File Settings…
  11. Browse the location where you have moved your existing Outlook Data File (OST), select the file, and click Open.
  12. Finally, click Finish to complete the process.
  13. Once you successfully configured your email profile and changed the location of the existing OST, go back to the Control panel and select Mail again.
  14. Click on the Always use this profile radio button, and from the drop-down list, select the New Profile.
  15. Click Apply to save the changes.

Method 2: Disable the Cached Exchange Mode and Configure a New Location for the OST

The second method involves disabling the Cached Exchange Mode, configuring a new location for the OST file, and re-enabling the Cached Exchange Mode so that a new OST file is created in the newly configured location. The new OST file will download all the mailbox data from Exchange data automatically. This is how you can do it in Outlook 2010:

  • In MS Outlook 2010, go to the File tab, click Account Settings > Account Settings (alternately, in your system, go to Control Panel, double-click Mail and click Data Files).
  • Now on the Data Files tab (of the Account Settings window), choose your account and click Settings.
    Note: Here, you can note the present location of the OST file if you don’t know it.
  • Now in the new window, go to the Advanced tab, uncheck the Use Cached Exchange Mode check box, click OK. Click OK.account-settings
  • Now again, click Settings, go to the Advanced tab and click Outlook Data File Settings > Disable Offline Use > Yes.
  • Again choose Outlook Data File Settings, browse for the new folder location of the OST file and click Open; click OK.
    Note: If you want to move an old OST file to the above location, first copy that OST file to the new location, and open it in this step.
  • Again on the Advanced tab, check the Use Cached Exchange Mode checkbox; click OK.
  • Now close all the open dialogue boxes and click OK.

Why do you need not move the OST file to another computer?

You need not move your OST file to another computer to use Outlook there. When you add your account to Outlook there and enable Cached Exchange Mode, a new OST file is created where you can get all your data.
Also, there is no need to keep backups for OST files as Exchange can create them afresh. However, after Exchange Server disasters and crashes, one can recover their mailbox data and convert OST to PST file easily. One can use third-party tools like Kernel for OST to PST to convert OST files to PST format.


The Offline Storage Table (OST) file is the Outlook data file that helps the Exchange Server accounts to work in the offline mode. The OST file saves a duplicate copy of the server mailboxes on the user’s computer. Although the user does not need to know the OST file location, if you want to change the OST file location to a safer place, you need to know the correct path to access the file.


TechNet Expert Reviews on OST to PST Converter tool