This happened to me. I was accepted to MCW in January, waitlisted at IU. Last week I received an e-mail from MCW saying that I had been accepted at two institutions. I called IU and asked them if this was correct because I had not received anything in the mail or a phone call. IU told me that MCW was not to release this information but that I had been accepted and placed at one of the satellite campuses at IU. To make a long story short, MCW gave me the deadline of today at noon (so 1 week). I STILL have not formally received anything from IU. They said letters were sent out last Friday. With the holiday weekend and the race, mail can get behind a day or so in Indianapolis. So hopefully I will have my packet from IU today. At any rate, I e-mailed the director of admissions at MCW and they granted me a small extension through the end of the week. In conclusion, it seems like there is no set policy on either end.