[jgosline]

I have the same issue, its because your company likely uses security features and since the Evo is running 2.1 and only offers pattern lock it won't accept the changes. I have to use Touchdown, while not perfect, does the job. WOuld rather have it in the native app since I prefer that calendar view, but it'll work. Touchdown has the security features built in, so that is why it'll work and the native app won't, when 2.2 (Froyo) is released, it will enhance the protection, including password/pin unlock and then we should be able to use it. Until then, you'll have to use Touchdown or some other mail client to get your corporate email.