With Google Apps standard and Premier, both use the Gmail mail server
platform. With Premier in addition to the standard applications you
also have Postini's policy management and recovery service. Google
Apps for Administrators provides an extensive amount of information
for managing Google Apps.
The support site at
https://www.google.com/support/a/ provides help
from getting started, domain basics, to managing the different
services, including Postini's policy management and recovery. As for
Postini's services, this takes an additional understanding of the
integration with Gmail and how users are managed.
Google Apps is the next generation up from basic Gmail and will take a
bit more understanding of how email services and DNS work. Once that
understanding is achieved, managing Google Apps will become much
easier.
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