Related question - MS told me I had to wait until 30 days prior to the expiration of my current pass before renewing - even via the disney website. But reading this thread it seems like I can renew on-line earlier. My AP expires Dec. 6 but I won't be back at WDW until Dec. 13th I want to renew it at DVC rate. MS also said I could renew on Dec 13 at WDW since you can renew up to 30 days past the expiration date. My concern with on-line renewal is the getting the exchange certificate in time. Any thoughts?
Unless you are trying to spread out your spending, I'd renew at WDW. By renewing online you are not saving any time as you still have to go to Guest Services to exchange your voucher for the actual AP. You will get the DVC renewal rate at WDW as long as you show your blue member card.