Hi! XP SP3 doesn't exist, and isn't in development. SP2 was the last for XP, and all efforts are now focused on Vista.

I think it's not important at all,and I think Mac OS X is better.

Windows XP Service Pack 3 will support Juniper the later this year the user management solution, in new patch package key renewal network correlation function, including Unified Access Control and Network Access Protection and so on.In addition, Windows Vista or Windows XP the SP3 user will experience a simpler convenience Juniper the UAC deployment process, will not need to install the deployment extra client side software again.

The New patches will focus on updating network-related functions, including the Unified Access Control and Network Access Protection, and so on.It can solve the problem of too many trojans and loopholes users are facing now.But overall,compared with SP2,it doesn't add new functions for most users.