The math support in MS Office is sufficient for some tasks and it's actually very usable then. But I find it woefully underpowered when it comes to typesetting

The math support in MS Office is sufficient for some tasks and it's actually very usable then. But I find it woefully underpowered when it comes to typesetting advanced stuff. I come up against its limit quite regularly (I need to make my slides in Powerpoint for $REASONS). Also, annoyingly, it slows down significantly when there are lots of nested blocks (e.g. subscripts, superscripts, which I need often).