Alternative To Windows Mail?

I just switched to Vista and cannot get Windows Mail to work the way Outlook Express did. The two major problems I am having are:

1) I have two email accounts ??? one personal and one for my business. In OE, I simply set up two ???identities??? and selected the one I wanted to use. Whatever identity I had selected would become the email address for outgoing and incoming messages. Now all In messages are commingled. For outgoing, I cannot figure out how to send from my business email ??? everything goes out with my personal address in the from line. From reading the posts here, it seems Microsoft requires that you create separate User Accounts for each email account. This is rediculous.

2) For my personal email account, I kept multiple sets of addresses within the Address Book. I had three: Personal, Church and a club I belong to. When you created an email, OE has a pull down menu to select which set for which you want to see the list of contacts. Apparently this feature is now gone and when I imported all three sets were combined. It makes things very unwieldy.