OfficeTalk lets you define a range over which the Find Slot functionality will operate. For example, you may wish to hold your meeting in the afternoon on any weekday except Tuesdays.
You can do this by pressing the 
button to display the Custom Day dialog box.
Choose the range for the availability searches and press OK. The Find Slot functionality will use this range for the remainder of the OfficeTalk session or until the range is changed again.
Note: When OfficeTalk starts up, the range is set to be the same as the workgroup custom day.