Following Apple’s lead in trying to keep pornography off its iPad and iPhone products, Microsoft has announced a new set of policies for the Windows Phone 7 Marketplace that will not allow porn or sexually suggestive content.

The application certification requirements for Windows Phone 7 program developers states that Microsoft will no longer allow content such as, “Images that are sexually suggestive or provocative, Content that generally falls under the category of pornography, or Content that a reasonable person would consider to be adult or borderline adult content.”

In February, Apple began blocking “adult” applications and sexually suggestive screen shots from its online stores in response to “numerous complaints from our customers about this type of content.”

In May Apple CEO Steve Jobs said his company would not be a party to the pornography industry and hoped that the iPad and iPhone revolution would help lead to a porn-free world.

“We do believe we have a moral responsibility to keep porn off the iPhone. Folks who want porn can buy [an] Android phone,” Jobs said, referring to the product of competitor Google, which has permitted a pornography store app for its smartphone.