Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.
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You have a hyperlink like mailto or contact where you are clicking for sending mail in the website right? right click on the link and copy the link location (in Firefox) or copy shortcut (in IE)
Paste it in notepad. there you have email id and can send it using any webmail, say gmail, yahoo, hotmail et al.