Show Associate With on Save 
When you save a Microsoft Outlook item that has not already been associated with data in SAP Business One, this function allows you to make an appropriate association.
You have selected Show Associate With on Save in the General Settings window (in the Microsoft Outlook menu bar, choose
When you try to save the open item, the Associate With window appears automatically. You can then make the necessary selections for association.
If you are not logged on to SAP Business One, the logon window appears.