Symantec have now released a patch that fixes the issue of definitions being dated 12/31/2009. However, the patch so far is only available for those running 11.03 or 11.05. For more details read the official statement on the Symantec forums or the Symantec Knowledgebase article . Most of our Endpoint Protection Servers were running 11.0.4 (as live update does not upgrade the server console component) so we have to upgrade to 11.0.5 first. This can be seen as a good thing as 11.0.4 has the nasty feature of filling up the hard drive of the server as Symantec downloads and keeps 3 copies of the av definitions every few minutes as it tries to download definitions dated in 2010 (and fails). So far, most of the Endpoint Protection Manager upgrades have been fairly simple with straightforward instructions – a 25 minute process after the files have been downloaded (including backing up the database) but we had one site that didn’t work and we had to reinstall every single Symantec Endpoint Protection client and server by hand. Not a lot of fun.