Microsoft Released CU9 for Exchange 2013 and recommend their customers to upgrade to this version as it has a lot of bug fixes in it. For more info on this release you can look here:


To upgrade your servers you can do so in the following order:

  • Internet facing sites first.(If you have separate roles then your CAS first and after that your MBX servers)
  • Edge

If you are running a DAG then you need to put the server into maintenance mode first, here is a link for the script to do so:


Note that there are 2x PowerShell scripts to download, once to put the server into maintenance mode and the other to take the server out of maintenance mode.

maintenance mode

To do the upgrade it is fairly easy, you run the setup (from the CU9 file you extracted) as administrator and then follow the prompts. You can let the GUI do the AD/Schema Upgrade or you can run it manually from an elevated prompt.

In this exercise i am going to list all the screen shots but they are all self explanatory.

ExchangeCU9a1 ExchangeCU9a2 ExchangeCU9a3 ExchangeCU9a4 ExchangeCU9a5 ExchangeCU9a6 ExchangeCU9a7 ExchangeCU9a8 ExchangeCU9a9 ExchangeCU9a10 ExchangeCU9a11 ExchangeCU9a12 ExchangeCU9a13 ExchangeCU9a14 ExchangeCU9a15 ExchangeCU9a16 ExchangeCU9a17 ExchangeCU9a18 ExchangeCU9a19 ExchangeCU9a20 ExchangeCU9a21 ExchangeCU9a22 ExchangeCU9a23 ExchangeCU9a24 ExchangeCU9a25 ExchangeCU9a26 ExchangeCU9a27 ExchangeCU9a28


Hope it helps.