Create a Web Mail interface using Macromedia Flash.
link the interface to an email server of your choice (use one you well familiar with) you can use open source
Have a login page then the usual email folders - Inbox, Reply, Compose, Send, Sent, Forward, Drafts, Delete, Attach file, Address book, Trash.
Include a simple user management console for
- Customer can update password
- Set up external Mail (POP3)
Create Administration console interface for adding users etc ( if the one that comes with the server looks ok I can use it)
Include editor when user is composing email.
The Flash design interface should be simple. The most important thing is for the interface to be done in flash I can customize further from there.