Outlook2010 Windows Mail separate?

Can I have separate accounts in Outlook 2010 and use windows mail for personal accounts? Have people done this with out confusion between the two? I didn't go though the set up and use it because I didn't want it to absorb my business account in the set up by accidentally migrating it which would cause big problems. (Especially the calendars).

Also I noticed when I send mail with outlook 2010 it usually sends 2 messages. I assume that one is txt and the other html. Do most people only get one when they look at it? Like when I'm sending emails they don't see two different emails that are the same in their inbox I assume. When I test it and send it to myself in outlook I only see one but I'm not sure if that's just because I'm using outlook? When I send it to hotmail it looks right as well, but again as I said I don't know if thats just to specific providers that it works or to all? Most are using google apps for their email, or zimbara.

Outlook 2010 is a destop mail program with no alternative meanings.
"Windows Mail" was the desktop mail program that only came on Windows Vista.
"Hotmail" can be either a website (hotmail.com) or an email address (@hotmail.com).
The desktop email program for Windows 7 is "Windows Live Mail".