Well there was an article written about Chrome no longer supporting XP and Vista (I believe) that stated that previous Chrome users could install Opera instead which apparently still supports those older OS's. Also with Vista still supported until next year you would think most program writers would still have support for Vista (yes I know that it isn't their obligation, but people still have Vista and would like to use their products).
50.0.2661.102 m Don't know why the "M", but it did update to this (from 50.0.2661.102). Assume it's a small patch update. Off topic: Wow v50. This thread started when v17 was new. A lot has changed, eh?