SOAP will work with any operating system, application software or programming language. Letting employees use company e-mail after hours may be dangerous. First, it could open the doors to intruders into the company system. Note that the first successful hacking into the Microsoft system came through an e-mail to an employee's computer at home. But there also could be a legal liability.
Some experts make a letterhead analogy.
If an employee sends a threatening letter on company stationery, the company could have some liability, even if it did not approve of the letter in advance. Similarly, an employee who uses company e-mail to send a sexist joke to someone could thrust the company into a liability role. Experts urge even the smallest companies to develop e-mail policies. Spell out exactly what an employee may or may not do with his company e-mail address. Monitor employee e-mails to look for violations or other dangers.