does anyone know of an offical MS forum for end user questions on Windows Phone 7?

I need to know:

1. How does Microsoft MyPhone 'sit' with Windows Phone 7? I have one and my People hub sync's contacts from my Live account. Should I need to use MyPhone now? Is there an app for it?

2. How often (if at all) do the contacts (people) sync from my live account? I've purged a few contacts, will my phone get my updated list?