I was upgrading to Exchange 2010 at a customer. And the first thing I need to do was to install servicepack on the Exchange 2007 servers. Currently they only had SP1 installed.
I downloaded SP3 and started the setup.exe. But it couldn’t be upgraded.
Beremote was stopping the upgrade. Beremote is Backup Exec, and I went into services.msc and found Backup Exec service and stopped it.