Works well on my nokia 800 (mango): sync email & calender for 2 google apps (with own domain) and 1 gmail account. Had a birthday date issue once (the day was off by 1 in some gmail contacts) which I had to fix manually but works again now. I love the Windows Phone, well the Nokia 800 - nicest...
I also retired Weather Master recently (as it was never - slightly exagerated - correct).
My current weather app is WeatherPro which I like much better. Both, the UI and the data quality are great!