We currently have three different domains that each have an exchange server - exchange 2003 - domainA, domainB, and domainC. We are trying to consolidate so we may use exchange 2010 so each person can see calendars, share address books, etc.
We don't have time to create a whole new forest and migrate the three domains under one new parent forest (I am being told that we could make domain.int, but we could not move the existing domains underneath domain.int - we would have to migrate the objects to a new domain such as child1.domain.int from the current domains)
If we were go with setting up exchange in a new domain, i.e. domainD and place the mail server in that domain. 1. could we use trusts to host the mail for domainA, domainB, and domainC in domainD? 2. Could we block administrators from the other domains from managing the new domain (i.e. admins from domainA would not be able to setup a mailbox, etc - they would have to contact corporate - domainD- to setup a mailbox for them using the accounts from domainA, domainB, and domainC).
We would like to get the mail running as soon as possible, then come back later and create a
parentdomain.int and migrate the domains as child domains, but this will take some time.
All input is appreciated!