Have transferred multiple domains recently to the excellent free email service.
Things I've found >
There will be a temporary email address to forward email to, e.g.
This will mean you can forward emails from exchange to google and they will be there waiting when the domain switches over.
Gmail’s excellent ‘Plus Addressing’ system works on Google Apps accounts and can be used with their filtering system.
It is explained in the link below, but the short of it is you can use a ‘+’ sign to create email variants and control spam.
They all go to your email but you can filter on the ‘to’ address.
For example firstname.lastname@example.org (me)
email@example.com (address i give for facebook)
firstname.lastname@example.org (ditto amazon)
Then, when you start getting Viagra adverts, you know who has passed on your email address!