No special requirements for hardware or software.
If monitored computer can run Microsoft Windows XP/2000/2003 Server operating systems, the Email Spy Pro will run as well.
The computer on which you read the e-mails sent by Email Spy Pro can be ANY computer, including Windows, Macintosh, Unix, Linux and Sun. The only requirement is that that secret email account must have sufficient Inbox storage space to receive all the emails from the monitored computer.