Does anyone know if there is a way to check for the received email in the mailbox?
If yes, is it possible to check for specific words in the subject line or text of the new emails?
And my last question, is it possible to access the attachments in the new received email and save them in a folder?

The answer to all of your questions is yes. I have written classes that do this using Outlook Automation. If you have a copy of MegaFox: 1002 Things You Wanted to Know About Extending VFP, Chapter 4 gives you a couple of ways to do this - 1 using Outlook Automation adn another using MAPI.