OK, latest MS cock-up :-).
Why do I persist in pioneering for Microsoft.
I have installed a Windows 2012 R2 Domain and an Exchange 2013 Server, plus other 2012 R2 member servers.
I have created all user accounts and I'm now assigning Exchange accounts as I transition the companies old PC systems into the new domain.
There is an existing externally hosted IMAP shared mailbox for the customer services department which is an ideal candidate for a Shared Recipient mailbox in the Exchange environment.
Problem is no matter how I configure this Shared Mailbox I cannot get any accounts to be able to send emails from this shared mailbox. I have assigned Full Access Permissions, Send As and Send on Behalf Of and all permutations of these and still no go.
What I expect to see is when I create a New Email is the From drop down box to show me the Shared Mailbox email address but it doesn't. If I add it manually I immediately get a Non-Delivery Report.
In other configurations I have been able to Send but the email drops into the main recipients Sent Items rather than the expected Shared Recipients Sent Items.
All very time consuming and frustrating.
There is some reports on the web about similar issues but no fixes that I can see.
Has anyone got a definitive How-To guide?