For those of you who are trying to get MacGPG working with Microsoft Entourage and have tried the EntourageGPG files which don't work for the newer versions of Mac OS X.  Here is a short tutorial that gets this functionality working.  It is actually very simple to do.

1. Download MacGPG
2. Follow this MacGPG tutorial to get all your keys working and installed
3. Install GPG Tools
4. Start GPG Tools and tell it where to find MacGPG
5. Go into Entourage
6. Write a new mail message
7. Highlight the text that you want to encrypt
8. Go to the Entourage Menu
9. Go to "Services" -> "GPG Tools" -> "Encrypt" or "Encrypt & Sign"
10. Double click the recipients you want to be able to read it
11. Click OK
12. Enter your own passphrase
13. Click OK
14. And voila!  Your encrypted text will now be in your email in place of the text you highlighted.

1. Highlight the PGP message (include the ---START--- and ---END--- lines)
2. Go to "Entourage" -> "Services" -> "GPG Tools" -> "Decrypt"
3. Enter your passphrase
4. Click OK
5. And now your text is back to normal.

But how do you decrypt an incomming message?  Do the following:

1. Open the Email you want to decrypt by double clicking on it
2. Click on the the edit icon that looks like this:
   
3. (Now you are able to edit the message)
4. Highlight the PGP message including the ---START--- and ---END--- lines
5. Go to "Entourage" -> "Services" -> "GPG Tools" -> "Decrypt"
6. Type in your passphrase and hit OK
7. And now your message is decrypted.

At this point you can now do two things.  Either close the message and save it which will keep the unencrypted contents stored in your mail folder, or for the truly secretive, close and cancel changes which will discard the decrypted message and keep only the encrypted message in your folder.

I hope this helps.