People have been suggesting that as long as you call before the 11 months mark of the end of your stay then your room should be available for you to continue on your stay. I do think that this reasoning is probably correct so once you have your reservation started you should be able to call just another 4 times (maybe it'll be 5?) to finish out your stay - assuming MS lets you add on days up to 7 out from the day you are calling. ie, you can call April 5th and add on 7 days, then April 12th and add on again.
But I do feel for you and and other's because you and they bought under a particular system and now that has been changed and it could possibly be difficult to get the reservation started if you bought with a particular room category in mind.
However - can I be jealous and have no sympathy about your staying 5 weeks!Lucky you and I hope that it will work out ok.
Thanks Kathy - I hope you are right - because if not the chances of us getting our vacation time will have really, really narrowed down. We stay at OKW, home resort, lucky we are not in a smaller resort. But still they are at about 95% the entire time we are there and it pushes to 100% between Palm Sunday and the week after Easter!