Note that tagging every question with the version the user has is also going to be pure noise. Some features, bugs, etc. will undoubtedly carry across versions; the version the user has is irrelevant in most cases.
As such, on the Android site we only put version tags on questions that need them:
- Questions about new functionality in a new version
- Questions about bugs only found in one version
- Questions about upgrading from one version to another (both tags applied)
And so on. I suggest we do the same here.
As Windows Phone 8 (or whatever it's going to be called) is going to be a major upgrade and likely to address a lot of the current deficiencies in the OS, with more APIs making more things possible, some Q&As are likely to be irrelevant at best and confusing for new users at worst, once it comes out.
As nobody here can know or disclose the changes in WP8 at this stage, it may be necessary to tag these questions once it comes out with WP7, in my opinion.
Tags that don't add anything should not be used.
you can use the "7.5-mango" or "mango" tag for questions that are related to a specific update but since almost every device (soon to be every since microsoft is already discontinueing the 7.0 marketplace) is a mango device it doesn't add anything.
Maybe as soon as Tango hits we can get Tango specific questions. but how long does it take for these tags to be old and become main stream?