Hi Naidur,
0; You are absolutely right, the MBA internships are designed for people that have completely an undergraduate degree and have typically had a few years of work experience because the level of work that you'll be doing requires a solid foundation in prior industry experience. I really admire your passion for starting your search this early!0; There are jobs targeted at undergrads at www.microsoft.com/college --> click on university --> click on internships. On the left hand column, you'll see internships anywhere form marketing, to legal, to software/hardware, to user experience, etc, etc!
By getting internships, you're setting yourself up for getting an awesome FT job after school, which will set you up for business school and getting that MBA degree :)!
excited for you,
yinner