1) Replace Outlook with Windows Live Mail Tongue Out

At least that's what I am doing at home. Also it works very well with Hotmail, which in term, is awesome with WP7. Works better with hotmail because whatever I did on WL:Mail, it will be reflected on my hotmail, Contacts, Calender, Block List, and Spam button. Outlook has too many features that, I would have to keep track what settings are local and not supported on Hotmail.