with a base exch 2013 installation, i created a general AD user account called imap_agent. Then added the acct to the 'Exchange Trusted Subsystem' group so it would have access to all existing mailboxes.

I could then use the following imap command to access any mailbox:

. login domain/imap_agent/user1{imap_agent pswd}

after installing CU7, the imap login no longer works

Any suggestions? if not, how do i report this problem to MS

• Edited by mnsandler Monday, February 23, 2015 7:07 PM

thanks for the replies.

first i checked dsa.msc and my imap_agent acct did exist in the Exchange Trusted Subsystem group.

then i check ADsiedit.msc, and imap_agent was not listed as a member item of the group.

so i closed both consoles and went back to dsa.msc and deleted imap_agent from the group, closed the console, reopened the dsa.msc console and added imap_agent back to the Exchange Trusted Subsystem group.

Then I opened adsiedit.msc, and now imap_agent exists as a member of the the Exchange Trusted Subsystem group.

i retested my imap connection, but it still doesn't work using the imap_agent account. I reset the imap_agent pswd just in case and it still doesn't work. I deleted the imap_agent account and recreated it. no change.

One interested note. if i try . login domain/user2/user1 {user2 pswd} where user2 was added directly to the mailbox via the EAC, the imap connection works. user2 is a mailbox user.

so the imap protocol is working, what is not working is the authentication of my imap_agent account.

there is a similar thread but identifies the CAS as the issue in the end:

https://social.technet.microsoft.com/Forums/en-US/c7e00535-75ec-49ff-9fab-4d675eec7f26/0x800ccc0e-imap-connectivity-problem?forum=exchangesvrclients

did a little more testing...

the imap_agent account (i created) works when accessing the other mailboxes via OWA and MAPI

something about imap just doesn't work right when using a non-mailbox user account to access other mailboxes.

can someone tell me how to submit this issue directly to microsoft?