Gutan,
Sorry, I just can't answer that because I don't know your environment. You'd probably want to hire a wireless expert to manage this type of upgrade, as you may not be able to go straight to that version (or preferable the latest version) without passing through certain intermediate versions. What I can say is that keeping up to date with the current versions is good IT practice for many reasons, both from an operational and security perspective. In addition, it allows you to add current model APs to your system without having to resort to secondary markets like ebay and the challenges associated with that.