I have a bad feeling about this...
All very well & good, but many people will be running legacy systems that even originally bore about as much relation to MS best practice as David Cameron bears to the word talented.. and will probably go down more times than a Clinton intern. Have you got any good related disaster recovery-recovery info regarding this procedure if it all goes Welsh NHS?
Have you got any network load figures on the different methods - cos I have images of networks going completely Gormless George even if its done without users printing their CV & downloading last weeks Game of Genetic Sexual Attraction (except near Lord Carey).