I maintain a stand-alone network that uses Symantec Endpoint Protection Manager 11.x for Windows XP.  I normally go to the Symantec site weekly for the latest virus definitions which come in a .jdb file.  The last couple of weeks, the page I normally go to points to virus definitions that are 1-2 weeks old.  Sometimes, I go back to the same page later in the day and it's up to date.

Today, the .jdb link points to vd3a2822.jdb, which says it was created 08/20/2012.  A co-worker in another state goes to the same page and sees vd3a4811.jdb whose creation date is 09/04/2012. 

I'm guessing everyone doesn't go to the same physical site when they go to the website.  Probably multiple servers to carry the load.

Is there a known time when these servers get updated?  Is there a certain time of day/week that's best to go get these .jdb files?

Thanks.