To change the colors, follow these steps in Outlook
Change the background color:
Go to the Tools menu
click Options
click Calendar Options.
Under Calendar options
go to Background color list
choose the color that you want.
Note: The color that you choose is applied to the Day and Work Week views.
Week and Month views use system background colors, which are gray and white,
by default. The color that you choose is applied to weekday hours. A darker
shade of the background color is applied to night and weekend hours.
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