Short answer:
Animated GIFs are supported in Outlook on Windows and Mac, but require a supported version of Outlook and the correct display setting enabled.
Animated GIFs in Outlook
Animated GIFs are supported in both Outlook for Windows and Outlook for Mac.
If the animation does not play in Outlook on Windows, it is typically due to using an older Outlook version.
The minimum required version that supports animated GIFs is:
16.0.12325.20344

Enable animated GIF playback
Make sure the setting Play animated GIFs is enabled in Outlook:
- Go to File > Options.
- Select Advanced.
- Scroll to the Display section.
- Enable Play animated GIFs.

