OKWAVE INC. operates online greeting card (eCard) services under the Davia brand. More than 13.6 million users have joined Davia services since its inception. The headquarters is located in San Francisco, and the R&D center is located in Tokyo. OKWAVE Inc. is owned by OKWAVE (Japan) which is listed on the Nagoya Stock Exchange, Japan's second largest exchange, behind the Tokyo Stock Exchange. Its ticker symbol is 3808.NG . OKWAVE (Japan) received strategic investmentx from Rakuten in October, 2007 and from Microsoft in March, 2008.