I agree to divide between a Microsoft and a general tag. But only creating a "UI-automation" tag would be too less in my opinion. The "Microsoft tag" should be renamed too to make clear that it's not the general one.
Depending on how many questions are flagged right/wrong (in case of using the existing tag) we could make a new one for Microsoft and use the existing for general. But all existing questions must be revisted and maybe retaged, what can only be done by users who have editing rights as the questions per se are not to changed and so "normal" users failed because the script notices that nothing has changed.