Kudos to Trend Micro for providing a very seamless upgrade from OfficeScan/ServerProtect 7.3 to 8.0. To my surprise, it was as simple as validating the new license key, downloading version 8, and install on our central TrendMicro AV server. Our AV server then seamlessly and quickly pushed out the client updates without user interruption. In addition, there are some nice features in the new version that we can take advantage of.
I was anticipating a nightmare of uninstalling clients and re-installing (similar to the nightmare Symantec caused us a couple of years ago... arrrggg, curse you Symantec!), but it was actually very pleasant.
Thanks to Trend Micro!