Microsoft is inviting selected members of the press and “VIPs” to a September 15 event in San Francisco where it will launch the beta of Internet Explorer 9.

The theme of this beta launch revolves around developers and designers coming together to showcase the “Beauty of the Web.”

According to a recent post on Microsoft’s Windows Team blog, “invitees get an e-mail invitation with a link to a special HTML5 website. To RSVP, they have to complete a word puzzle by creating a single word out of the letters “V E A N T I” and filling in the phrase “Unlock the _ _ _ _ _ _ web.”

(The answer is “Native.”)

Microsoft has launched four developer previews of IE9 since March 2010. Company officials haven’t discussed the final due date for the latest, more-standards-compliant browser, but many insiders think it will be in 2011.

[via]