17. Rich Media/Flash in Email Message
The consensus on using rich media in emails is: Just don’t do it. Most email clients do not support Flash or other types of rich media. If JavaScript is needed to launch the rich media, it is often stripped out due to security concerns. If you must use animation, use an animated GIF, but watch the file size. If you’ve developed a really cool rich media application you want to showcase, include a link to a Web-hosted version, which gives you more control and broader browser acceptance.
The animated gif’s will not be displayed on outlook, When you receive an e-mail message that contains animated graphics, such as animated .gif files, only a static image appears on outlook.
Please refer to the link : http://office.microsoft.com/en-us/outlook/HA102014391033.aspx
You can also look at converting your flash files to animated gif images and then link to the flash website through the link click, so that users can visit the web page for a good streaming experience.
Read earlier blogs on the subject “Guide to a Better HTML Email Design” on Kenscio Blog.