Not only does it work, it works GREAT. My vista preloaded 1 year old (otherwise state of the art) laptop was almost headed down a 13 story building and nearly tipped over the edge out of sheer frustration, when windows 7 made it perfectly usable again. Similarly, KR crashed the crap out of the same laptop (or any computer i played it on) causing it to overheat and crash to desktop or to off (yes, off, as in: had to put it on ice and then reboot the computer). Now with SA client and windows 7, it runs like butter. Has yet to crash in two weeks. My UO life has improved 1000% since these two pieces of software came together.
Also, let me put a shameless plug in for the SA client -----> IT IS AWESOME! BEST THING THAT HAPPENED TO UO IN 9 years!!!! I met the future of UO and I like it
Disclaimer: i am not receiving anything from microsoft or EA. In fact, i am not even in the content Beta...