Virus Scanner Management Agent Upgrade
Windows Vista and Virus Protection (previous) :: Bandwidth management teething problems (next)
Noticed any changes to the icons in your system tray?
As part of a virus scanner management (ePO) agent upgrade, your anti-virus system tray icons have changed from (notice the red circles) 
to 
When you click the new RED M, you can see the old familiar icons.
The management agent helps to ensure your machine is up-to-date with anti-virus definition files and that your Microsoft patches are also up-to-date.
The upgrade to the agent was necessary in order to get new virus scanning software functioning on Microsoft's latest operating system, Windows Vista.
The anti-virus software that you are running has not changed and will continue to update in a timely fashion.