Shame that Microsoft haven't given Linux Office 365, because Microsoft ♥ Linux. Right?
For my basic needs, I've found that the office web apps actually work much better than the classic ones. Outlook, in particular, is much snappier. I use it daily on Firefox on Linux for work, since they're married to MS.
I think the only issues have been some formatting options are hidden, I honestly don't remember them because it mostly works.
It was more a cheap jab that they don't want to actually support Linux.
Hell, my last two HP laptops, nothing fancy, had worse hardware support on Windows than on Linux (where they were working 100% since day one), even with all the HP drivers installed. Took them about a year to fix this. So even "don't need to futz around with drivers" is no longer a reason.
And I think MS realizes this, seeing that recent .net things work on Linux, MSSQL Server now works on Linux (but not the studio, though). So, I guess they're just trying their damnedest to stay at least somewhat relevant. Companies are usually a bit slower to change user-facing things, so I guess MS won't go out of their way to help with the switch.