Sadly, as you said, the 3300 is manually DST changes anyway. The Messaging Server (6510) - that one is spotty if you don't have version 2.0. According to Mitel's DST document version 2.0 is fine as long as you put the patches on the host OS, but they fail to mention 1.5 or older. I'd contact Esna and see what they say.....