ASK THE EXPERT: Does My Company Have The Right To Read My Email?

Wendy Garcia from The Philippines (Quezon City) asks:

I work for a large corporation in the finance department. In connection with the investigation of suspected embezzlement, my employer looked at my saved e-mail at work. Then, from some forwarded messages, discovered my home e-mail address, and convinced the Internet service provider to allow the company access to that e-mail as well. Does the company have the right to read e-mail at work? What about my private e-mail at home? pls answer my question asap thanks