You have a few options when you deploy Office 365 into your organization and soon you will be having another option to the list which will hopefully...
I've been asked by a client to put a disclaimer on the button of the emails. I've gone into the Exchange Management > Mail Control > Rules and added...
I posted the old URL to the Deployment Wizard, You should really use this one as it gives you the option as depending on weather you have an W14/W15...