another email project for fuzzoid

Im looking for an email program like squirrelmail, but built into the admin of oscommerce, so there will be one central place where I can contact customers, send them emails, reply to their emails etc without having to use a seperate email client. The email program must be built into the oscommerce admin, and function like squirrelmail or outlook etc..... Im looking for the most modern email client please with well designed user interface. I have 3 different email accounts per shop, so I need to be able to download all the mail for those 3 email addresses into one inbox, so I dont need to login and log out all the time to access different email accounts. It must use the osc admin user and password so I dont need to login again to acess the email program. When I click on a customers email in the order page, the email must open in the new email program and automantically contain the customers order number and a some text in the subject and ready for me to write a message. Additional options or settings: Autosender, text, html, font size, font colour, add signatures and autosignature, add new folders, adds sent emails to contact list automatically, search function to search any folders. Please give me your best bid and time to complete.