While upgrading to any service pack or CU of Exchange 2013 (and earlier), you can’t have other CU’s installed. Before you can get started with an upgrade, head into Programs and go to “View Installed Updates.” Be sure and remove the CU or SP that you have installed, then start the upgrade. Otherwise, this will be your error:
In this example, the CU could be any version before the version you’re trying to upgrade. Keep in mind, a service pack is just a glorified CU, so you’ll get this error if you have a CU installed while trying to upgrade to SP1.
I just tried to install the upgrade, it gave me this warning, then I tried to uninstall the CU and it’s giving me errors!
Well, yeah, now that you’re half way through the upgrade process, you’re going to get errors if you try to install the CU in the update listing. That’s most likely because the first step to upgrading Exchange is to disable and stop a ton of important services. So, to uninstall the CU, you’ll need to change the services back to Automatic, start them, and then try to uninstall again. Rebooting will not fix this issue, because the services are disabled, not just stopped. So, here’s the process:
- Uninstall language packs
- Stop Backup Services of any kind
- Uninstall the CU before hand
- If you tried to upgrade and couldn’t, then tried to uninstall the CU and couldn’t, start the Remote Registry Service and Exchange Services (may not be necessary) to get the CU uninstall to work.
- Finally, begin your upgrade process
I hope this helps everyone. Cheers!