Similar is the case for applications, hence you will have to uninstall the 32-bit application and then install the 64-bit one, if available.

The default installer for Office 365 is the 32-bit version. If you need the 64-bit version of Office, we'll show you how to get it.

If your version of Windows is 64-bit, you're able to install both 32-bit and 64-bit software programs, so there are two different "Program Files" folders on your computer. However, 32-bit versions ...