Here is the link and list of stuff you need to know before kicking off CU1 on Exchange 2013 servers. Nothing is major at first look, the order to install updates has changed, since the business logic moved into MBX role this time we start from MBX role and go to CAS server, if CAS is sitting on separate server in your environment.
I think most of deployments in E13 will be all in one and separation will less or not make much sense when rolling the dices.
- Upgrade your Exchange 2013 server roles in the required order. First, upgrade Mailbox servers and then upgrade Client Access servers.
- After you install a cumulative update, you must restart the computer so that changes can be made to the registry and operating system.
Open CMD with administrator privileges on the E13 MBX server
run the fallowing command from CU1 binaries directory, the install will take time.
E:\Cu1>setup.exe /M:upgrade /IAcceptExchangeServerLicenseTerms