If you have a support contract with them - I really suggest you contact them instead.Below is an excerpt from the Symantec Antivirus knowledgebase, Symantec antivirus, although it updates the same as before, doesn't recognize a date newer than 2009.
Since 12/31/09 rev xxx is considered the latest content available to the SEPM, a client will not update to a content revision later than the highest numbered revision available on this date.
To mitigate this issue, Security Response is no longer incrementing the date on SEP Security Content and instead only incrementing the revision number of the content.
I’m currently working in a Citrix Xen Desktop environment with pooled, non-persistent desktops.
Citrix PVS is used to stream a read-only v Disk to VM’s on a Xen Server infrastructure.
If I run it again after a successful download, it will always say it's up to date.
I don't think it is an issue of getting the virus definition. Well, first of all - this site is really not a substitute for the Symantec's techsupport.
This issue can manifest in the following ways: The following is a list of the expected behaviors of affected Symantec software with default configurations.
If the settings for functionality such as alerts or notifications have been altered from the default values, it is possible that your experiences may vary from those below.
To correct the definition date showing on SEP 11.0.x and SEP 12.0 SBE clients, customers can configure clients to download the latest ‘Virus and Spyware Protection’ definitions directly from Live Update.