SUBTERRAIN.NET

Microsoft Exchange Server is a messaging and collaborative software product developed by Microsoft. It is part of the Microsoft Servers line of server products and is widely used by enterprises using Microsoft infrastructure solutions. Exchange's major features consist of electronic mail, calendaring, contacts and tasks, and support for the mobile and web-based access to information, as well as supporting data storage.

Here are a few of the top sites for exchange server hosting:

1. http://www.rackspace.com/solutions/mail/managedexchange/index.php?CMP=Go... - Rackspace Managed Exchange Server Hosting
2. http://www.intermedia.net/ - Intermedia - Exchange Server Hosting
3. http://www.mailstreet.com/ - MailStreet Exchange Server Hosting