I've just installed Evolution-2.6.2-5.msi and tried to launch Evolution via shortcut on my desktop and nothing happened.
There were two processes: gconfd-2.exe and evolution-2.6.exe. After a moment gconfd-2 exited and only evolution process stayed.
There are no errors or warnings in Events regarding Evolution.
Tried manually run Evolution.cmd and step2.cmd.
Yeah, same thing for many other people.
Waiting for developer to fix...