Questions on installing CommandByEmail

To all,

I'm about to install the "CommandByEmail" extension and I am on 3.6.4. 

I have a couple questions:

1) Can I use the latest version with 3.6.4?
2) When I go to Tools->Offline I see what appears to be a form for 

creating a ticket. Is this the basic format to be used by those users
that want to use “CommandByEmail” to create/modify ticket via Email?

I know these questions may seem trite, but I haven't had any experience 

installing this stuff. Most of my time has been using it and we did not
set our RT session up to use this extension.

Thank you.