Entourage Error: -17895

I haven't been able to find any helpful information on this error but it appears to be an issue with Entourage. I have 4 accounts set up in my Entourage, when I go to set up number 5 it tosses an error. At first I thought it was something with my host and the email server. However, if I set this account up in a different email client it works fine. Also, I have changed the combination of which accounts are the first 4, any account will work if it is one of the first 4 I enter and any account of mine will error if it is the 5th account I set up. How do I get Entourage to accept more than 4 accounts?

Here is a screenshot of the error:
http://www.venzandsons.com/images/error_17895.png