Exchange 2013 RTM CU1 Stops Transport During Prerequisite Check

Tuesday, April 2, 2013
I was hoping this issue would be resolved before Exchange 2013 RTM CU1 was released, but apparently not.  This only affects upgrades from Exchange 2013 RTM to RTM CU1.

During the installation of Exchange 2013 RTM CU1, setup runs a prerequisite check on the Exchange 2013 RTM server.  Among other things, setup checks to see that required Windows features and roles are installed.  If they're not, setup cannot continue and you need to cancel the installation to install the necessary prerequisites.  The prerequisite check stage is also the last point where you can cancel the installation for any other reason.

Unfortunately, setup stops the Microsoft Exchange Transport service during the prerequisite check and does not restart it if you cancel setup to install the prerequisites.  This means that email flow is affected prior to installing CU1.

If you do cancel installation for any reason after setup runs the prerequisite check, make sure you manually restart the Microsoft Exchange Transport service.


  1. good to know Jeff. I am sure we will run into this in our lab

  2. After the prerequisite check failed for me my SMTP receiver failed to work. I was upgrading a 2013 RTM to RTM CU1. I had to restore my Domain Controller from a backup before SMTP would work again.

  3. I had the same problem as Anonymous from April 14th. SMTP receive connector died after running the prerequisite checks. Eventually came good several hours later when I finally got this beast of an update installed and rebooted.
    Also, keep in mind that the prerequisite checks may sit at 96-97% for over 20 minutes and look like nothing is happening. This is just to trick you into killing the install and starting again for another 20 minute session.


Thank you for your comment! It is my hope that you find the information here useful. Let others know if this post helped you out, or if you have a comment or further information.