I have 2 domains running off 1 exchange server. I have no issue creating users and adding them to mailbox stores from domainA (where the exchange server resides)
I have installed the exchange connectors on a DC on DomainB where i would like to give an admin access to create new groups and users with mailboxes. He is able to see existing email addresses on existing users, but when creating a new user or group he is unable to select a mailbox store. the drop down box is empty. it allows for mailbox creation but it want to select a store which does not exist so it doesn't allow for creation of user.