Any new versions that you have tried to download/install. Important: If you already installed the 64-bit version, but want to install the 32-bit version instead (or vice versa), you must uninstall the version you dont. So we bit the bullet(tested first) and decided if MS is pushing 64bit by default now is the time to start using the 64bit version. Old or trial versions of Microsoft Office Professional Plus 2013. This will open Registry Editor, where we will want to navigate to HKLMSoftwareMicrosoftOffice15.0Outlookbitness.
Type ' regedit ' in the provided command line. Then a while back i was doing some testing and grabbed a fresh copy from microsoft and realised MS had at some point switched the default installer from 32Bit to 64bit on their website so all our home users we're getting the 64bit version anyway without realising it and no one had been complaining about issues. Type Windows Key + R or type 'run' in the start menu and launch to open the Run interface.
For the longest time we pushed out the 32bit version (local network install downloaded from Microsoft) because we would get weird random issues that just didn't happen with 32bit or we would have an edge case where the accounting software (Sage50) was just not updated to work with 64bit Outlook / Excel for whatever reason. 64 bit is the default download when a O365 user goes to the Office Portal and downloads Office.