Select the option to output to Mobile Phones and Players.
The output options that use the H.264 codec in this category produce MP4s.
I have the same query, wanting to export to .mp4, but I am using PE4.0. I don't think PE4.0 has the Mobile Phones and Players output option. Is there another way?
Not unless you use a third-party program, like Super Video Converter or, even better, Quicktime Pro ($29 from Apple.com). Quicktime Pro is designed to do this kind of conversion from many of the formats Premiere Elements 4 can output!
Premiere Elements 4 does not have MP4 output capabilities.
Thanks Steve, as helpful as always. Quicktime Pro worked and I managed to get an MP4 version. The resolution wasn't great but at least it converted.