I am in the process of moving my school to Google Apps, and today was supposed to be the day to flip the switch by directing mail to Gmail rather than the highly frustrating email service we currently use. Unfortunately, that was not to be. Instead I, and the awesome consultant from OunceIT, worked all day to create forwards from that service to the temporary gmail address. Why did it take all day? Well, I am also standardizing the three naming schemes, so there were many users who had to have aliases created in both Google and in the old service, and those aliases had to be forwarded to Gmail as well. Of course while doing this, the interface would require several clicks to get back to the screen that allowed us to make changes. This was an enormous investment of time for something that will be meaningless in about a week.
On the positive side, the mail transfer started with only one small hiccup.