I seem to have missed the news from a few days back that during a broadcast on the @ch9live development network , Joe Belfiore, Microsoft Corporate Vice President for Windows Mobile, confirmed multiple Exchange account support in Windows Phone 7 Series. Goodbye to unsupported hacks or POP/IMAP’ing those additional Exchange boxes. I assume includes all the additional benefits like Direct Push (hello battery life!).
In addition, Belfiore stated that on Windows Phone 7 various calendars will be displayed in a single view using coler coding to differentiate between the calendars (i.e. accounts).
Thanks to fellow Exchange guy Magnus Björk for spotting this one.