A frequent equest is "How do I see who organized these meetings?" Easy: use a custom view that includes the organizer field.
If you need to see the organizer for just one item in Outlook 2007 or Outlook 2010, the organizer is displayed on the appointment in Calendar view. The Organizer's name, along with the Subject and Location, is shown in the Day or Week view (space permitting).
If you want to see a list of the organizer's, you'll need to use a table view, such as All Appointments or By Category. You can select the view from the View, Current View menu. In Outlook 2010, switch to the View ribbon and select List from the Change View menu.
After adding the Organizer field to the view, you can group by the field.
To do this, right click on Organizer and choose Group by this field.
To remove the field from the view, either drag it off the row or right click on the row of field names and choose Customize Current View, then Reset.
The Organizer field is the same as the From field, so you can use the From field from the All Mail items in the Field Chooser.
Right-click on the row of field names and choose Field Chooser to see this dialog.