hosted (webbased) outlook express

Microsoft Outlook express is not supported on a Windows 7 pc anymore, so a "webbased solution or online-acces-to-outlook-express" is needed to keep on running with outlook express and make it more flexible. Please make an offer for making outlook express online available as a SaaS / cloud computing solution and give me the yearly costs to host and support 5 existing mailboxes. The requirements are: Webbased solution for working with outlook Express, working with IE8 or higher, provide a https-secure login, filtering internet-access with one IPadress, outlook express must be applied with anitivirus, antispam and mailscanner, the existing .wabfile must be supported to import all adresses and subfolders, existing mail and adressbook must be backupped every month, and direct support withing 4 hours when online access is not available. PLease make an offer for the setup of this online access to Outlook Express and make an offer for the yearly costs for hosting and supporting the webbased outlook express environment.