Transitioning from 2003 to 2010 - Multiple Domains

Hi There,

I have a site that is running Exchange 2003 with 12 primary email domains. We will be moving them to 2010 but have never carried this out with multiple primary email domains.

During the migration OWA and activesync must work.

1. Do I need an SRV record for autodiscover for each email domain?
2. Do I need an SRV record for "legacy" for each email domain in order to keep activesync etc working during the transition period?

thanks