Users often complain about the patchwork look of Outlook 2007/2010′s calendar. This is caused by setting All Day Events to Show time as Busy and setting a color category on the item.

Items marked with hash lines are Tentative.
Items marked Out-of-Office are always purple, with the block around the appointment text using the category color.
Timed appointments are shown in the category color and the Free/Busy tags are shown in a small bar to the left of the appointment.
Tentative has hash marksBusy uses the category color.
Free is white (Outlook 2007) or a lighter shade of the color category (Outlook 2010).
Out-of-Office is purple
Day and Week calendars are also shown in the category colors when All Day events are marked busy or purple when the event is marked Out-of-Office. (In this screenshot, the Tentative appointment has a blue background because it’s on the weekend, which is shaded blue.)
Appointment form showing the location of the Show time as command and All Day event box:
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Can someone please tell me if there is a way to set your free days as the color white in Outlook 2010, is this possible or is it set in stone that your free days will always show up as a lighter shade of the color category.
You can’t change the colors of items marked Free. Sorry.