[KAKershaw]

Is there a way to view wmv files on my jaialbroken iPhone when sent as an attachment via e-mail?

[santiagoeche]

iPhone Video Server they will convert all your wmv attached to your hotmail or gmail account to mp4 so you can watch them in your iPhone. No need to jailbreak.

[CBRIAN]

Download AttachmentSaver via Cydia. It will allow you to save the attached WMV file. The attachments are saved to var/mobile/library/attachments. Then you will need to access and play the WMV file with some type of media player such as vlc4iphone, yxflash or AVPlayer.