Move OST to another location

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https://support.microsoft.com/en-us/help/2752583/

To set the ForceOSTPath registry entry in order to change the location of the .ost file,follow these steps:

Click Start, click Run, type regedit in the Open box, and then click OK.
Locate and then select the following registry subkey:

(16.0 = Office 2016, Office 365 and Office 2019, 15.0 = Office 2013).

Right-click Outlook, select New, and then click Expandable String Value.

Right-click ForceOSTPath, and then click Modify.
In the Value data box, type the full path of where you want to store the .ost file (such as D:\MyOST), and then click OK.
On the File menu, click Exit to exit Registry Editor.