The next phase was replacing Office, and it came with a huge backlash. The chief complaints where not so much about OpenOffice funcionality (along with some "it's *UGLY*!"), but about compatibility with MS generated documents. As of yet, it has been impossible to take MSOffice away from the "higher-ups", as any single minor UI or functionality change is bitched about as if it was a sign of the Apocalypse.
Though definitely not an easy change, it can be done in small steps and with minimal disruption. YMMV, mostly on how dependent you are on MsOffice...
The first, compatibility, is still correct; and will never go away for technical reasons not to be discussed here.
The second, 'higher-ups' are the usual bore. They tend to feel threatened when a. they'd have to confess to a lack of ability, publicly, b. consider themselves to be too important to relearn a little bit. (My boss already yells when the attachment to a mail opened with Outlook fails to pop up on the correct one of his two monitors.)
Third, you missed this one, the last straw is always the fact, that these people can't install their own software any longer. They bring their IrfanView.exe from home, and it doesn't do at all what they think it should do.