Euro's... AUD....
Could it be that the value of both those currencies has dropped? MS may claim that's a justification, but for those on the receiving end, its irrelevant.
I'm surprised that MS has gone with this quite so early on though. "How does this compare with paying one fixed price in the past" will still be fresh in people's minds.
Sun Tzu say, "the best tactical solution may not align with the best strategy." (Ok, he probably didn't, but piling on the MS Office bandwagon because Visio is the best may not have been a good long term plan.)