Outlook 2016/2019 Change OST file location

How to change Outlook OST file
location in Outlook 2016/19...

Scenario:

Your C drive is running low on space and you have a massive OST file you would like to move to another drive on your PC/laptop.

You've noticed that the old way of relocating an OST file no longer works in the newer versions of Outlook 2016/2019.

Quick warning...

This fix includes editing in the registry, please be careful! This fix will mean you need to re-setup your email account once the registry has been changed to force the new location.

how to change ost file location outlook 2019

Step by step...

  • Using the Windows 10 search bar type regedit
  • Click to launch registry editor
  • Click yes on the warning to proceed
  • Expand to HKEY_CURRENT_USER\Software\Microsoft\Office\(version)\Outlook
  • Version will be either 16.0 or 19.0
  • Right click some empty space on the right hand side
  • Click new → string value
  • Rename the new value to ForceOSTPath
  • Right click ForceOSTPath → click modify
  • Change the value data to where you would like the OST file to be located
  • Example D:\Documents\Outlook Files
  • Close registry editor and re-setup your Outlook account
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