RE[4]: My answer is a no.

Can open source replace Microsoft Exchange?
Open source projects and vendors are trying a variety of technical approaches to replacing the expensive but ubiquitous Microsoft Exchange.

RE[2]: FOSS drop-in replacements
Everyone knows that Microsoft Exchange is expensive - but ubiquitous a " and plenty of open source projects and vendors have been trying a variety of...

Ferris Research Announces Results of First Cost Analysis of...
First published research finds that Microsoft Exchange 2007 + OCS 2007 + telephony can cost up to $180 per user per month for small businesses.

Kerio MailServer 6 drops in as a Microsoft Exchange replacement
Kerio Technologies, Inc. has announced the availability of Kerio MailServer 6.6, which includes resource management and a new tool for migrating...

Microsoft Wireless Notebook Laser Mouse 7000 Mac/Win USB
This advanced ergonomic 2.4 GHz Wireless mouse is designed to provide a more comfortable, responsive computing experience - anywhere.

Microsoft Bluetooth Notebook Mouse 5000 Mac/Win
This is the Microsoft's most portable wireless notebook mouse that connects directly to a Bluetooth PC without a transceiver, freeing up USB ports...

iPhone: The Missing Manual: Covers the iPhone 3G (Missing...
The new iPhone 3G is here, and New York Times tech columnist David Pogue is on top of it with a thoroughly updated edition of iPhone: The Missing...