Seen on OSNews.com:
Microsoft To Cut Off Dual-Boot Windows Option -
PC Vendors that ship Windows-ready machine can currently offer two Windows flavors preloaded onto a hard-drive. New users can simply select the version they want, and then boot directly into that OS. But Microsoft is about to pull that option, and require PC vendors to only install a single Windows flavor on each PC they sell. Read the report at ExtremeTech here and here.
http://www.extremetech.com/article2/0,3973,760198,00.asp
http://www.extremetech.com/article2/0,3973,760254,00.asp

http://www.reactos.com/
I was waiting to post about this until I understood it.
Read this for more info:
http://www.osnews.com/story.php?news_id=178

http://www.ibmlink.ibm.com/usalets&parms=H_902-274
http://slashdot.org/article.pl?sid=02/12/11/1 … =thread&tid=136
http://www.extremetech.com/article2/0,3973,763064,00.asp
Confusion on the survival of OS/2.