If you bought the Apple iPad, and had an iPhone 4 you might have been a bit disappointed.
Once you put on your company account (for example like something hosted on AINEO Secure) you were only able to set up IMAP, POP3, AOL, Gmail, or MobileMe accounts. That was lame for the vast majority of those individuals using Hotmail for example. Well, two good things happened.
Apple updated the iOS for iPad finally in September. That allowed you to add your exchange account on you@yourcompany.com but you could add another person account that supported groupware such as me@bqf.jp for example. With this new update you can have multiple account. Probably the best part of the update!
Just beware, every time you update your iPad iOS, the apps you bought at the Apple App Store disappear. You then have to go and reinstall every one of them. Hopefully, Apple will resolve this one soon as it is a pain if you are using Pages, Keynote, Numbers for example.