[streptomycin]

It's not nearly as big a problem for Microsoft. First of all, the compatibility problems are much bigger between LibreOffice and MS Office than between different versions of MS Office. Secondly, if you tell your colleague, "Oh, the margins are screwed up because I upgraded to MS Office 2051", they'll just shrug it off. If you tell them, "Oh, I'm using this new software called LibreOffice because blah blah blah", they'll probably yell at you for being a moron and wasting their time.

[bad_user]

If my colleagues ever said I'm a moron and that I'm waisting their time for using LibreOffice ... I would tell them to either buy a Windows+Office license for me, or otherwise go fuck themselves.

[streptomycin]

And if you're in a position to tell your colleagues to go fuck themselves, then you can do what you want. The rest of us aren't so lucky.

Also, the cost of a Windows+Office license is so small that pretty much any company will happily buy it for an employee.