Online Express emails can use images in the file formats of jpg/jpeg, gif, and png. If a desired graphic was created directly in Word, such as a shape or SmartArt, then that image is not in a format that is usable in Online Express.

To convert that graphic to format usable in Online Express, please refer to the follow Microsoft support article:
Save a picture as a .jpg, .gif, or .png (in Word or PowerPoint) (These steps are specific to Word 2007, but the same general steps should work in multiple versions of Word.)

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