In a number of countries, companies don't have full rights to snoop on employees' network communications, even at work. In Denmark, I believe email is considered quasi-private. A boss can read an employee's mail, but must go through a process where the reason they need to do so is formally documented.

The situation is not entirely clear even in the US: http://online.wsj.com/article/SB125859862658454923.html

Thanks for the info!

"Now, courts are increasingly taking into account whether employers have explicitly described how email is monitored to their employees. "

Yes this is why all contracts have been updated. It's in most new contracts. (The 'fine print'). Best thing to do is not use the company e-mail privately (if you value your privacy that is).