How to change appointment colors in Outlook?
Sometimes, you may want to highlight your appointments and make them easy-to-find in Microsoft Outlook. The common way is to change the appointments’ color. Here I will introduce two tricks to change appointment colors in Microsoft Outlook with ease.
Change color for one appointment in Outlook
Auto change color for multiple appointments in Outlook
Change color for one appointment in Outlook
It’s quite easy to change an appointment’s color in Microsoft Outlook. You can get it done easily by right-clicking the appointment, selecting "Category" from the drop-down list, and specifying a color from the submenu. See screenshot below:

When composing an appointment, you can also change its color by clicking the "Categorize" button on the "Appointments" tab, and specifying a category color from the drop-down list.

Auto change color for multiple appointments in Outlook
In this section, I will guide you to change the "Calendar" folder’s view settings and set up "Conditional Formatting", so that Microsoft Outlook can automatically change colors for multiple appointments easily.
Step 1: Shift to the "Calendar" view, and open the "Calendar" folder where you will change the color for multiple appointments.
Step 2: Click the "View Settings" button on the "View" tab.

Note: In Outlook 2007, you can click "View" > "Current View" > "Customize Current View".
Step 3: In the opening dialog box, click the "Conditional Formatting" button (or "Automatic Formatting" button).

Step 4: In the "Conditional Formatting" dialog box:
(1) Click the "Add" button;
(2) Enter a name for the new rule in the "Name" box;
(3) Click the "Color" box, and specify a color from the drop-down list;
(4) Click the "Condition" button.

Step 5: In the popping-up "Filter" dialog box, specify your filter criteria.
For example, to change color for all appointments whose subject contains "test", enter "test" into the "Search for the word(s)" box.

Step 6: Click all "OK" buttons to close all dialog boxes.
Then Microsoft Outlook changes the color of all appointments that meet the filter criteria you specified in Step 5 automatically.
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