Microsoft recently added "Happy Animations" to the Outlook Web App. These always show a shower of splendor when Outlook recognizes "happy" words like "congratulations" or "happy birthday". It is in no way anti-glitter. Apart from the fact that glitter and computers do not really work well together, you should clean your hardware regularly. But there is a time and place to sparkle, and there are no business emails. Many of you may also see this in your personal e-mail.
The "Happy Animations" appear when an email you receive appears in the Reading Web section of the Outlook Web App. All words that are considered "happy" are highlighted. When you hover over it, a glimmer of glitter appears, rising and falling like a primary firework in the wind.
Note: These animations are only available in the modern version of Outlook Web App. If you still use the classic version, they will not be displayed.
How lovely. Here's how to turn it off. Click the Settings gear, and then click Show All Outlook Settings.
option Go to the "Email" settings, and then click "Compose and Reply."
Scroll down the right side, uncheck the box labeled "Show Joyful Animations in the Reading Pane," and then click Save.
 Congratulations! You will no longer see any sparkle when you receive an e-mail with a "happy" word.