If you want to search all mail items (Inbox and Sent Items) in Microsoft Outlook 2007 for the text: “test” and group by received date and not date and time:
Click in the Menu on Go > Mail :
Click on “All Mail Items”
Click in the Menu on View > Current View > Customize Current View… > Other Settings 
Check the “Show items in Groups” 
This will group by date and not date and time, the group by box contains a field: Date 
This will group by: Yesterday, then all days of the current week, then last week, then all weeks of current month, the last month, then older
But after the first week it reverts to Last week and then two weeks ago and doesn’t really show by date any more. I want the divider to be at each specific date and not day or week.