If it was active before and contains your OST files and PST, I doubt that uninstalling Outlook would help with the storage issue. Although there is a way to only remove Outlook from the Office installation.
Here are the steps:
- Press the Windows key + R then enter appwiz.cpl
- Select Microsoft Office then click the Change button on the menu
- Tick the Add or Remove Features option and then click on the Continue button
- From the drop-down list of programs, locate the Microsoft Outlook option, and then click the disk icon next to it.
- Set it to Not Available and then Continue
- That's it. Other apps should remain except for the ones that are set to Not Available.
If you decided to remove Outlook, it is best to look for the location of the files from the Outlook app but it should probably be here by default. I would suggest transferring them to an external disk if you have one in case you need them in the future.
C:\Users[User Name]\AppData\Local\Microsoft\Outlook