At the time of writing this, there are 722 questions tagged as [`[excel]`][1] & 161 questions tagged as [`[powerpoint]`][3]

I propose that the tag `[excel]` be renamed to `[microsoft-excel]` and `[powerpoint]` to `[microsoft-powerpoint]` considering the questions on Microsoft Word & Microsoft Access are tagged with `[microsoft-*]` prefixes


[1]: http://superuser.com/questions/tagged/excel
[2]: https://i.sstatic.net/nPQbt.png
[3]: http://superuser.com/questions/tagged/powerpoint