Have Outlook store mail data in a drive other than C:

As with many things Microsoft things that you would think are simple to do can turn out to be, perhaps unnecessarily, hard.

All I wanted was for Outlook to store its mail data (stored in .pst and .ost file) in E: drive instead of the default C: drive but for that, at least with the latest version of Outlook (2019) you actually need to edit the Registry.

Here is how:

Obviously, you can have it point to a full path and not just the root directory of a drive.

Source: https://www.datarepairtools.com/blog/move-offline-outlook-data-file-ost/