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Does the 64 bit version offer much practical advantage over the 32 bit version which is installed by default?
It is most likely better to use 32 bit. Depends though - see the link @Bree posted (#9 in this thread).
There are many reasons to use 32 bit over 64 bit. 64 bit is only required if you make really huge files but then you lose all the 32 bit advantages - compatibility mainly.
Choose between the 64-bit or 32-bit version of Office - Office Support
I'd seen the advice from Microsoft before, so looked it up for the OP. Actually the advice had changed emphasis since Office 2013, where 32-bit was recommended for most users.
https://technet.microsoft.com/en-us/.../ee681792.aspx32-bit Office is recommended for most users
We recommend the 32-bit version of Office for most users, because it's more compatible with most other applications, especially third-party add-ins. This is why the 32-bit version of Office 2013 is installed by default, even on 64-bit Windows operating systems....
Simple to change Office 2016 Pro Plus from 32 bit to 64 bit, (For 64 Bit Systems) IF you have your Product Key (also usually associated with your Office MS account/email).
Must Uninstall your 32 bit MS Office 2016
Must run the Office Remove/Clean o15-ctrremove
https://aka.ms/diag_officeuninstall
Must REBOOT PC
Then download install live App, use this 64 bit URL,( MUST Change or add in your actual Product Key in URL below ), then run it after small download has finished (7 MB), once the App opens it will auto download and install full version, once finished Activation must be done again, select Product Key and enter your key number, will also ask to associate MS Account.
https://c2rsetup.officeapps.live.com...&version=O16GA
Copy and Paste Above 64 Bit URL in browser and MUST Change and enter your own FULL Office Pro Key
The only compatibility issue with 64-bit Office that I am aware of is with compiled Access applications. An Access app compiled with 64-bit Office will not run on a system with 32-bit Office. So if you have 64-bit Office and want to make a compiled Access app that runs on 32-bit Office you have to recompile the source code on a 32-bit Office system and then use that to distribute to other 32-bit Office machines.
There was a compatibility issue with having 32-bit applications installed when I installed the 64-bit version of Office 2010 [first version to have both types], had to remove FrontPage 2003 and older Viewers such as PowerPoint Viewer which were actually stand-alone installs, not removed when uninstalling Office 2003.