We have a NY office .com and a London office .co.uk. The NY office is a single domain/forest configuration and so is the London domain. Both offices have their own Exchange servers.
The UK office is planning to migrate their the mailboxes onto a new Exchange server on the NY .com domain. This server will be hosted in London.
My question is do we go for a single forest or multiple forests with forest trusts between NY and UK. The users want one GAL and have the ability to connect to mailbox calendars from each site.
Thanks in advance