This document was found at http://www.cisco.com/en/US/docs/wireless/controller/4400/tech_notes/Wireless_Software_Compatibility_Matrix.html as recently as 8 Nov 2011. The new version of the document is now at
(A redirect will be put in from the old URL to the new one.)
Hi, the latest Wireless Software Compatibility Matrix document is available under the 5500 series controller:
We'll work on getting users to be redirected to this new URL from the old URL.
Apologize for the inconvenience.