Software ad "Politick"

Software and “politick”
“I will not advertise freely for Microsoft!!!”
“Microsoft licenses are expensive”

This has become a big debate in the usage, teaching and training of Campus wide users. A number of questions have been raised and some of the questions are:
Should we train users on MS Office suite or Open Source Suite?
What do our clients use?
What do our clients want to use?
What are our users’ needs?
What software is readily available to our users/clients?
Is it expensive to get an authentic MS office suite licence?
…. “ you can add on to this debate”….
I have been exposed so much to MS office suite from the time I started on my computing journey. I would like to say, I am very cormfortable in the usage of MS office and of late I have upgraded my suite to 2010 version.
I would like to make a few claims, found or unfound, that MS office suite is readily available on Wits University computer laboratories; most of the offices at this campus use MS office and most educational institutions (GED, FET and HET) in Gauteng use MS Office suite. From these claims I have made (off cause without statistical backing) I would advocate for training our users/clients on MS office suite.
… What is your take?