Well, the system MS uses is imperfect, and frequently confusion arises after points transfers. The points do keep their original home resort (tho sometimes you have to insist that they do it manually, or fix it when the original home resort disappears). As for the Use Year, I believe the theory is that the points change to your UY, at least they did for the point transfers (*2) that I received last year.
I will check on this tomorrow with MS. I just got another point transfer (VB) that I intend to use next February. My UY is Feb, while the points' UY was originally Oct. MS put the points into my 2005 UY; I expect will need to bank them to use them in Feb '06, even tho they would have been good in Feb '06 in their original UY. I'll let you know then.