Do I still need antivirus software on my machine? (Yes!)
Yes, even though U-M blocks viruses at the mail gateway, you still need antivirus software on your machine—and it needs to be configured for automatic updates.
Here's why:
Not all viruses spread through e-mail. You need to protect your machine from viruses that attack by other means.
When a new virus is discovered, there will be a delay between the virus discovery and the release of new filters. You increase your chances of protection during this time by having antivirus software on your machine.
If you use multiple e-mail accounts, you need to make sure you are protected from virus-infected mail sent to any of those accounts.