When you receive an e-mail message that contains animated graphics, such as animated .gif files, only a static image appears.
Outlook does not display animated graphics files in the body of e-mail messages. Only the first frame of the animation appears.
You can view the message in your Web browser to see the animation.
View an e-mail message in your Web browser (Outlook 2016, Outlook 2013, and Outlook 2010)
Open the message.
On the Message tab, in the Move group, click Actions, and then click View in Browser.