Microsoft's next generation wireless LAN will be based entirely on Linux network appliances.

This is the result of a partnership between Redmond and Aruba Networks to replace Microsoft's existing Cisco wireless network with Aruba's
centrally-managed infrastructure.

Microsoft's new WLAN will be deployed in 277 buildings covering more than 17 million square feet using Aruba mobility controllers, mobility software and some 5000 wireless access points.

However Aruba mobility controllers run Linux which Microsoft has aggressively targeted as being inferior to Windows as part of its "Get the Facts" marketing campaign.

Mark Robards, Aruba Network's Asia-Pacific vice president told Computer World that the network's integrated security, including a firewall, VPN, and hardware encryption, and they are "all Linux-based".

More here.