As the question states, we have GoDaddy as our registrar and current e-mail host and will be migrating that to Google Apps. We realize propagation can take up to 48 hours, but Google and GoDaddy both say there should be no "downtime" as the e-mails will keep going to GoDaddy until Google kicks in. However, GoDaddy says there MAY be a few hours of downtime in the last phase of the switchover on their end.
Anyone have any experience with this? Did you experience downtime? As long as the e-mails go to one of the two accounts, we are fine with it. We are trying to decide if it's worth waiting until a major holiday to make a transition to minimize the chance of bouncing e-mail.