The problem with that is you have MS reigning supreme in
Windows, while
Open/Libre is the standard suite for
Linux and the rest of the world of open (currently, I don't do
MacOS so I don't really know who's the sovereign there)...
There are some good alternatives inside each of those universes, but as soon as you have to be hopping between platforms, you're pretty much screwed. That situation has got to end, period.
IBM had the muscle (and a mighty footing, at least in the
Windows &
Linux fields) to steer this closer to a proper solution. Sadly, they chose navel gazing on this one... so, it's farewell.

Let me stress that: as in nature,
diversity is good;
lock-in & system balkanization sucks.

EDIT (on topic):
http://opensourcepack.blogspot.pt/2011/09/portable-ibm-lotus-symphony-3-fixpack3.html