http://www.google.com/a/help/intl/en/security/education.html

The top package, “Message Discovery” includes email archiving and is not yet available to non-profits.

Here is the official update from Google:
—–Original Message—–
From: Google Message Security Team [mailto:message-security-sales@google.com]
Sent: Thursday, March 06, 2008 8:23 PM
To: Rob Shaw
Subject: [!! SPAM] [#249398631] Google Message Security and Compliance

Hello Rob,

My name is Peter, and I’m a Google Message Security and Compliance product specialist. Joe Murphy, one of our Google Search Appliance representatives forwarded me your information, and let me know that you were interested in Google Message Discovery. I know that you spoke to someone else in our Postini organization… I just wanted to let you know specifically what is
going on.

Google Message Discovery costs $25 per year per user. We are planning on making Google Message Discovery available for purchase online sooner rather than later, however at present it is available only through our
direct sales channel, with purchases of $1,500 or more. The 66% discount we have for non-profit educational institutions and US 501(c)(3) non-profits is currently available for purchases of $1500 or more as well.

For more information on Google Message Discovery, you might want to check out this link:
http://www.google.com/a/help/intl/en/security/index.html

In the meantime, feel free to let me know if you have any additional questions. I will definitely get back to you specifically when we have Google Message Discovery available online.

Best Regards,

Peter Griffin
The Google Message Security Team
650.214.4013