I have a complicated scenario that I will need to solve and I hope experts would be able to help me out.
Our client has on-premises Exchange 2007 installed on Windows server 2008 and they have six additional SMTP domain (accepted domains) in their Exchange environment. They have recently bought a new small business - let's call it as domain.com.au and existing users from the new company, they have been using their emails with hosted Exchange provider. Now they want to add one more SMTP domain (domain.com.au) to on-premises Exchange server and migrate their email domain to on-premises Exchange 2007 from hosted provider.
But I am concerned that this will cost them more as the current server is old and it needs hardware upgrade. So I suggested them that why not migrate the new company domain.com.au from hosted email to office 365? and then once migration is finished we migrate on-premises Exchange 2007 (with six accepted domains) to office 365?
I am thinking that once they migrate domain.com.au from their hosted email to office 365, they can add remaining six remaining domains to office 365.
Am I going with right direction? How would you do if you had this kind of case?