For MSUCOM, you are required to have two people (not necessarily professors) fill out specific evaluation forms for the college. They will send you these evaluation forms with your secondary application. I am almost 100% sure that I read somewhere (I cannot remember where...) that they don't even read letters unless they are attached to the eval forms..which still have to be filled out.
(this is from their website)
Recommendations: As youre building your portfolio, look for mentors, people who can help you make further contacts and perhaps write recommendations for you. We accept only two recommendations which we ask be submitted on our evaluation forms. We do not require academic/committee recommendations nor do we ask that one of your recommendations be from an osteopathic physician. The most important consideration is that these individuals know you well. They will be asked about your understanding of osteopathic philosophy, your academic potential, your commitment to service, your communication skills and your level of maturity. You may use individuals who have supervised you in a work or volunteer experience, coaches, clergy members, etc. Set aside time to meet with each evaluator so you can look over the questions on the form together. If youre uncomfortable about asking for such a meeting, this may not be the best evaluator for you.