This is kinda of a dumb question, because the awnser seems obvious to me. I just had new struts put on my car all the way around. WHAT A DIFFERENCE!!!!!! The left rear strut was totally blown, and the rubber boot was ripped in half. I mentioned that to my Technician, got the car back, and figured he would have put a new boot on the new strut. NOPE, he re-used the stock one, but it leaves have the strut open to water spray and dirt/road crud. The question of the day: will it negatively affect the long term durability of the strut? I don't want to take it back and complain about such a little detail, because then he'll have to break the whole assembly down again just to slip a new boot on.
Many performance coil-over systems don't use boots. **** , a lot of high performance truck shocks don't use them as well.

