Sophos Version 8
Sophos has ended support for version 8 of its anti-virus program in April 2014. This version was the last one to get updates on Mac OS 10.4 and 10.5. This means as new threats come out, those systems will not be protected. Users of those systems or older should upgrade their Macs as soon as possible. To upgrade, please put in a ticket: ITR self-service page
If you are running Mac OS 10.6 or higher, your Sophos has been updated to version 9 and no action is needed at this time. To check what Mac OS you have, click on the top-left Apple menu and choose "About This Mac".
To check your version of Sophos you are running, click the Sophos shield icon and choose "About Sophos Anti-Virus".
More information: Sophos v8 webpage