Rumored to be the app that will replace the out-of-the-box internet tablet email application, Modest for OS2008 is now out in beta.
Modest is a small e-mail program targeting hardware with modest resources, such as low-end PCs and Nokia N800/N810 internet tablets. Modest uses the Tinymail e-mail framework.
Modest supports multiple email accounts using POP/IMAP/SMTP and works far better than the current buggy email app. It currently cannot be set as the default email client and menus are only in English as of the moment.
Visit Modest's official dev page.