From horse's mouth
We're rolling out email antivirus protection as well as enhanced storage to help meet your growing needs. This will make MSN Hotmail, a world class email service that both scans and cleans ingoing and outgoing email for viruses and worms before they enter your inbox. Antivirus Protection
In addition to delivering world-class antivirus protection, you can also look forward to an upgrade in your storage capacity. In fact, you'll receive 125 times your current email storage with the introduction of a 250 MB inbox as well as the ability to send attachments up to 10 MB.
Fu Manchu and the Monkey Gang.