Windows 8 Calendar,Mail and Contacts apps.

Windows 8 has a fresh new look overall and its calendar, mail & contacts. There is no support for POP3/SMTP or IMAP in the RC.  It is confirmed that Windows 8 Production will get IMAP support.

Read the following detailed posts from Steven Sinofsky.

Designing the Windows 8 Calendar app

Building the mail app

The People app: the complete, cloud-powered address book for Windows 8