Hi support team,
I have a question about Exchange 2007 and Office 365.
We have Exchange 2007 to provide email service for our worldwide users.
One of our location would like to change use your Office 365 service.
For safety, they want us to keep their existings in Exchange server for a short period.
The problem was their domain will record to Office 365 for email server.
That means our Exchange server and Office 365 will share same domain in a short period for receiving emails.
This should have some conflicts because duplicate email address and their domain was registered in our DNS server.
It should caused our internal user cannot delivery emails to them.
Could you please help to check is it any setting or chance for Exchange and Office 365 work at the same time?
Thank you.
Best regards
Cary