Hi 
Only MS Office 2007 and 2010 are available on Mac. They are re-named as 2008 and 2011 but basically are pretty much the same. However there are compatibility issues with documents produced on one platform and then viewed on the other. Documents produced with 2007 don't always look at all right on 2010 let alone 2011. If produced in 2010 on Win Xp then even MS admits they wont look right on 2010 on Win7, nor Win8. Their idea of 'compatibility' is that everyone must be using the same version on the same OS.
Also while a student may not be considered to need various different parts of MSO it is still often claimed that moving away from MSO might be a bad idea for them because it means doing without those apps that are not even included in their version of MSO. Then there are tons of other bundles that each lack different parts of the whole suite. Again the missing parts are used as reasons why people can't migrate away from MSO.
I have just been helping 2 students on courses that are allegedly trying to teach about computers and the Access module parts were particularly tricky as they didn't have Access at home despite having bought the version of MSO that the colleges recommended. So many different bundles = so much confusion.
Rtf is no longer being actively developed. Also, as is typical of MS formats, it fails to be compatible between different programs or even same programs on different OSes, let alone different platforms. I've never yet met any office worker using Biff.
Almost all serious servers run non-MS platforms. Somewhere around 1%. Mostly it's small company servers but again they tend to go with unix-based platforms because of security issues.
Mobile devices seem to almost entirely run non-MS. The Slate's sales have been appallingly lower than estimated. The only person i know of that has run a Windows phone found it started crashing after just 2 weeks and at best is suffering slowdowns already.
All the 3rd party tools for reading documents that are in MS formats tend to be better at displaying LibreOffice documents because it's usually their native format too.
Regards from
Tom 