Originally Posted by lynnb
At present this is a Mac-only issue, but if/when (more likely when) Windows withdraws 32-bit support, Win users will face the same issue.
Just to put Windows users at ease... This isn't likely to happen for a long, long time.
There's an awful lot of 32-bit software in use - notably by Microsoft's corporate clients - and Microsoft has to keep those sweet. So, Windows 10 in its 64-bit incarnation (it installs as 32 or 64 bit - user's choice) happily runs 32-bit programs, and will continue to do so into the foreseeable future. Most software that Microsoft sells such as its current Office 365 has the option of being installed as 32 or 64 bit.
This is a separate issue from old programs being compatible with new versions of Windows - they may or may not work (as an aside, I run Windows 10, and the oldest program I still use is Vern, a virtual Windows app, from 2001 - 18 years ago!).
In short, Windows users can ignore this issue for many more years...