This from my SANS NewsBite email newsletter:

In an LA Times article the 9th US Circuit Court of Appeal has ruled that employers may not access employees' text and email messages if the company has contracted
with an outside organization to transmit those messages. According to
the ruling, employers may only access employees' email if the messages
are stored on an internal server. According to the ruling, employers may only access employees' email if the messages are stored on an internal server.

The original case was brought by
Ontario, California police officers who sued after a wireless provider
gave the police department records of text messages they had received.
This is the first federal appellate decision to provide 4th Amendment
protection to electronic messages.

I'll follow this more closely as it will weigh in on a decision to adopt Google Apps for Education. Have you or your district considered Google Apps to replace your internal mail server?? How would you handle e-discovery rules?