I'd like to upgrade my 3 ASA 5505s to v8.4.4(1) from 8.2.1. 1 in for standard internet access and the other 2 are used for a site to site VPN connection. My primary reason for doing so is to support URL filtering which I can't do on 8.2.1. The Asa that is for general internet also has ports forwarded for Outlook Web Access. How different is 8.4? Are my configurations going to get hosed?