I have A domain, Exchange2013 is based on A domain, but now have B domain, trust each other, between A and B domain
Now we are going to create B domain mailbox, and for the blog E3 mailbox, now step is like this:
1, in the B domain to create user AD, such as: user001
2, used in Exchange2013 Linked Mailbox, link to [email protected] email, and then create user Mailbox [email protected]
3, again to [email protected] email for migration to Exchange in the Online
4, B in the blog search domain user mailbox [email protected], find gives its management after E3 permissions, excuse me, is there a better way to create a domain user mailbox B? Thank you

This step tedious and error-prone because it is over, is there a better way to look tall person to give directions, thank you!