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You can set the background and text colors for calendar entry types, to do items, unprocessed meeting notices, and cancelled meetings.
1. Click File > Preferences, and then click Calendar and To Do.
2. Click Colors.
3. For each type you want to change, click the color field under Background or Text.
4. Click OK, and then close and reopen the calendar to see the change take effect.
Tip: Click Restore Default Colors to restore all entry colors to their original settings.
Related topics Calendar and To Do preferences Changing display of the calendar