Entourage Emails


I have several email accounts on my office computer and I can access all of them except the main one which causes Entourage to quit when I try to access emails. This has been happening since 1 June and I checked with email provider to no avail. I deleted all emails from the server to clear it out and now there are around 70 emails attempting to get through but it quits just before they get there! This is very frustrating.