I have a user who has office 2003, i upgraded their outlook 2003 to 2007.
When the user is in an Excel 2003 document and saves changes, occasionally she will
receive a Microsoft Excel message box (not all the time) The message reads;
Your changes could not be saved to 'ACCREXP.XLS' becuase of a sharing violation. Excel has created a temporary file with your changes preserved, called '27C2F0000'. Your can save the temporary file as a new name to lose your changes and all future changes.
The user will then select to " Save temporary file" , she will save it to her desktop then copy it back to the orginal folder. When the user saves document changes it is saved out on a net work drive.
I have installed outlook 2007 onto other user machines with Office 2003, but they are not receiving these errors.