Are the events of Enterprise considered canon?

The series "Enterprise" takes place a century before the events of TOS.

Are the things that happened in Enterprise considered canon or would they be a spin-off series of sorts? The specific events I'm speaking of are the temporal cold war, and the storyline of the Suliban wanting to destroy Humanity on behalf of the Sphere Builders.

Is anything that happened during Enterprise considered part of the Star Trek canon or have the creators of Star Trek chosen to pretend it never happened?