I'm going to guess not. Too many people use third-party programs like Norton. You know those guys, they swear by the program they payed for and won't consider changing. Until people open up to using free alternatives, Microsoft would be adding another step for them. First they would need to remove MSE, then install the other.
I can't speak for XP, but I know MSE is very trustworthy. I use it as my only AV, and it has never let me down.I barely trust Microsoft's security programs, dunno why but I think XP's Windows Firewall kinda set me off....
Yep, it will be an 'optional' add-on.
Maybe included in the Live Suite of products?
How hard would it be to change the name to MSSE Live!
Even though MS naming conventions can get a little skewif at times, it will stay as MSE simply because it will be an established cross platform A/V.
Changing the name of a 'brand' they are trying to establish will be counter productive.
It's kinda funny that we live in a world where a company could be sued for trying to include in their product the material to keep it protected.