is feature-rich when compared to OE, but that's to be expected - it's primarily designed with business users in mind. Outlook is so important to me, and I have used it for so long that I seriously doubt I would be able to run my business life without it.
You'll obviously find it a tad strange to begin with, but it won't be long before you're comfortable, and I'm sure you'll find some of the features very useful - I think it's worth having for the Calendar alone.
Importing your existing OE mail is very easy - just go to File and select import. Then select the option to import internet mail, and select OE from the menu that's offered.