Office X 10.2.3 Entourage client to Exchange 5.5

A new Macintosh PowerBook perhaps purchased during the December holidays is running Office X Entourage as client to Microsoft Exchange server 5.5 over a Windows 2000 Ethernet link.
After the user supplies the authentication password that corresponds to the login ID and the entries display underneath InBox, there is (even if one totally empties InBox) a "phantom" entry which contains no Subject or any other visible text. However, when the cursor passes over that "covered" secret line where a Subject should be, it produces a non-fatal error dialog (could not complete operation). But when the user CLICKS on the phantom line, it produces a fatal error dialog and then exits Entourage. When the problem presented itself, the Mac PowerBook was running Office 10.0.0 but the problem continued after update 10.1.2 and now also continues under 10.1.3 do I am interested in anyone who has encountered this problem and whether you have discovered a solution.