Wireless Network Adapter not working in Windows Server 2008 R2

Symptoms:

• No wireless networks are shown.
• You have a wireless driver installed.
• Windows device manager says the device is working properly.
• Intel Diagnostics says the wireless adapter is not present or disabled.

This is by design.

Solution:

1. Add a feature called "Wireless LAN Service" using Server Manager.
2. Done. :)

(Thanks to Farrukh Lala for the tip.)