The larger part of the existing outlook tags (approx. 60) should remain as they are. Many of them relate to the native Outlook, often in combination with the web based Outlook or Gmail.
The new questions, about Outlook.com, should be re-tagged accordingly and reviewed. If many haven't been changed, we didn't pay attention during the review process.
Google Docs is what Google calls their online office suite.
Google Documents is what Google calls their online word processor, which is a part of the online document suite.
Considering Google has rebranded Google Docs to Google Drive, the synonym for Google Docs to Google Drive is the correct one. Refer this previous meta post:
Makes sense, print is now mapped to printing
updating post history, 25 rows affected
updating posts, 17 rows affected
updating PostTags associations, 14 rows affected
removing/renaming old tag, 0 rows affected
updating count for master tag, 1 rows affected
tag remapping of [printing] and [print] complete!
remapping 0 synonyms
0 favorite and ignored tags ...
Three tags are referred to above:
At present the tag at the top has both the two below it as synonyms, as well as gchat.
All 82 Qs tagged google-talk are Closed – which seems appropriate, given the demise of the service in June 2017.
However there is also one Open Q so tagged:
How to set up Google Chrome to ...
mediawiki-commons at this time it has 0 (zero) questions, actually it is not listed on https://webapps.stackexchange.com/tags so just ignore it.
wikimedia-commons has 4 questions.
ale recently posted Please rename [commons] to [wikimedia-commons]
They are different products.
Outlook.com is Microsoft's Gmail competitor, and used to be Window's Live Mail. It also subsumed Hotmail (thus the synonym).
Outlook 365 is part of the Office 365 suite of products. It combines desktop and web components. Consider its analog to be G Suite.
Outlook Web Access is the classical web interface for an Exchange ...
Here's how I think we should fix this.
Get a good excerpt and tag wiki for g-suite
Make google-apps and google-apps-for-work synonyms of g-suite
Make google-apps-email a synonym of gmail (as suggested in this question)
Google Apps Sync is now G Suite Sync for Microsoft Outlook. Therefore, rename google-apps-sync to g-suite-sync. (I would suggest g-suite-...