Looking at the two tags
I'd say don't retag, but there's a few blockers to what to do
- Having a good tag wiki for the one we're keeping seems essential, and include the fact that it was called the microsoft store.
This can be done now
- is the 'store' name changed for windows 8 systems? I might be able to check on this if I can dig up one of my cheap chinese tablets that run that.
Wikipedia indicates that you won't be able to upgrade apps on the old storefronts after some date, so that's an arguement for keeping it separate. Any 8.x system would not have microsoft store ever.
- Is it worth creating a tag synonym ? that would mean we don't need to retag, and would 'merge' the tags in a fairly neat way.
Naturally only with a complete 1-1 mapping between them. Does not quite feel like that's the case.
As such, it might a good idea to do retags on a case by case basis as you encounter them only where the question is obviously about the version of the microsoft store named as such on supported windows 10 systems.