Multiple Exchange Accounts in Outlook 2007

Hello,

I have 2 Exchange accounts.  One for my consulting company (Prism) and one a client has set up for me (Harmony) using Office365.  Both accounts are active and include email, contacts, and calendar (meetings, etc.).  Currently I'm using IMAP in Outlook for the Harmony account and it's OK for email but very slow for some operations.  When I get a meeting request on my Harmony account, I accept it there using the Harmony web interface and then manually create that appt. in Prism.  Clearly, this is not optimal. :-)

So, I'm wondering:
      1. Is there a way to have both Exchange accounts in Outlook (in the same profile)?  I think I already know the answer but thought I'd ask anyway just in case I'm missing something.
      2. If I set up a second profile in Outlook for the Harmony account, would I need to 1) switch back and forth or 2) have 2 instances of Outlook running?  Is there a way to share/merge calendars if I have a second profile?
      3. I've tried to share my Harmony calendar from the web but had no success in making that work.  Is this possible?
      
My ultimate goal here is to have all my calendar info (meetings, etc.) in a single calendar (Prism).  I can live with IMAP for email (or switch to POP) but the calendar is really a problem.

I hope I explained this clearly enough.  Please let me know if you have any questions or need clarification.

Thanks,
Brett