Microsoft added a new tab "PC vs Mac" on the Windows 7 Compare section. It covers few comparisons on
Having Fun – Macs might spoil your fun.
Simplicity – Macs can take time to learn.
Working Hard – Macs don’t work as well at work or at school.
Sharing – Macs don’t like to share.
Compatibility – Macs might not like your PC stuff.
Choice -Macs don’t let you choose.
Here you can see the MAC website which says the advantages of MAC over PC
[Via Microsoft Watch]