After cancelling the install for Exchange 2013 CU5, users can no longer connect to IMAP.


Issue: The attempted install of Exchange 2013 CU5 was cancelled during the install process.  Afterwards users could not connect to the secure imap service.

Cause: CU5 for exchange 2013 install was attempted on these servers, hence they were put in maintenance state by CU5. Also found out that only the person/software that put the server in maintenance mode can take it off maintenance.

Troubleshooting/Resolution: From powershell type, Get-servercomponentstate servername. Found out Imap proxy was in an inactive state.

Resolution: This registry fix(though not recommended by microsoft) resolved the issue. go to
 HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\ExchangeServer\v15\ServerComponentStates\serverwideoffline

backup the servercomponentstates key
remove maintenance key
change functional key from 1:0:635407213073684026 to 1:1:635407212984929845 (Note that guid value is unique per server).


You are basically changing from 0 to 1 to make the server active. This activates all the inactive components