How to change highlight color in search results in Outlook?
Supposing you are searching the text of “test” in a mail folder, you enter the “test” in the search box, and then all “test” are highlighted in the mail list and in the reading pane. See screen shot:

By default, the highlight color is yellow. Some users may prefer to other colors rather than yellow. Here we will guide you to change the highlight color in search results in Microsoft Outlook easily.
Change highlight color in search results in Outlook 2010 and 2013
Change highlight color in search results in Outlook 2007
Change highlight color in search results in Outlook 2010 and 2013
To change the highlight color in search results in Microsoft Outlook 2010 and 2013, please do as following:
Step 1: Click the "File" > "Options".
Step 2: In the Outlook Options dialog box, click the "Search" in the left bar.
Step 3: Go to the "Results" section, click the "Highlight color" button and select a color in the drop down list. In our example, we select the green.

Step 4: Click the "OK" button in the Outlook Options dialog box.
From now on, the searching text is highlighted by the new highlight color in the search results in Microsoft Outlook 2010 and 2013. See screen shot:

Change highlight color in search results in Outlook 2007
The following steps will walk you through changing highlight color in search results in Microsoft Outlook 2007.
Step 1: Click the "Tools" > "Options".
Step 2: In the Options dialog box, click the "Search Options" button on the "Preferences" tab.

Step 3: In the Search Options dialog box, go to the "Search" section and click the "Change "button" "behind the highlight color brick.

Step 4: Pick out a color in the "Color" dialog box.

Step 5: Click all "OK" buttons in each dialog box.
After configuring the highlight color, you will see the searching texts are highlighted by the new color.
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