This will leave you stumped too!
If you goto microsoft marketplace, you can see Abi Word" listed there with description, "Open source and lightweight free document creator". Truly amazing ! I thought Microsoft had a policy of ignoring that other half (4% is share of Linux on desktop PC's) of software users/developers exist.
While we are at it, I found an interesting article while digging about Usenet on internet
This can be seen both right and wrong, after all most of us are making money by writing softwares :P
I bet even Bill Gates din't see something like GNU/Linux and no. of associated "free" software writers coming.