Notifications not working

Notifications not working

I installed and started using the free version of Service desk plus on 4/7/2011 and about 3 weeks ago the notifications and mail fetching stopped working.  I have not changed any settings except to update the mail server settings email passwords.  I have verified that the ports 110 and 25 are both open and working on our exchange server.  Also I upgraded to build 8011 hoping to solve this issue but it did not.  Does the free version not include this?  I am the only IT person in my company.
Version : 8.0.0 Build 8011

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