How to color code emails by message size in Outlook?
Sometimes, we may need to make "emails with large size" stand out from the rest of the email messages. So how to make this happen? This tutorial will introduce how to set up a rule to color-code emails based on the message size.
Note: Here takes "Microsoft Outlook 365" as an instance, the steps and descriptions may have some differences in other Outlook versions.
Color-code emails by message size using conditional formatting
To highlight email messages "over 1MB" in the Inbox folder, please do as follows.
1. Enable Outlook, open the "Inbox folder", go to the "View" tab, then click "View Settings".

2. The "Advanced View Settings: Compact" dialog pops up. Click the "Conditional Formatting" option.

3. The "Conditional Formatting" dialog follows. Click the "Add" button.

4. After you click the "Add" button, an untitled rule is created. Input a name in the "Name" text box. Here I name the rule as "Messages size over 1MB".

5. Then click the "Font" button to customize the color you want to highlight the email messages over 1MB. The "Font" dialog shows up. In the "Color" section, pick a color you like, then click "OK".

6. Back to the "Conditional Formatting" dialog. Click the "Condition" button to set up the triggering condition.

7. The "Filter" dialog shows up. Go to the "More Choices" tab. In the "Size (kilobytes)" section, select "greater than" in the drop-down list and input number "1024" in the text box. Click "OK".

Note: 1MB equals to 1024 kilobytes.
8. Click "OK" > "OK" to finish the setting.

9. Now you can see the email messages with "a size over 1MB" are highlighted in the mailing list.

Note: If you only want to "color code the emails with attached files whose size is over 1MB", in Step 7 of the Filter dialog setting, please also check the "Only items with" checkbox under the "More Choices" tab and select the "one or more attachments" option from the drop-down list.

After finishing the setting, you can see that "only the email message with attached files whose size is over 1MB" is highlighted.

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