SAN FRANCISCO (MarketWatch) -- U.S. Health and Human Services Secretary Kathleen Sebelius on Tuesday named former Microsoft Corp. MSFT, -1.24% executive Kurt DelBene as the new head of the HealthCare.gov site. The federal Website, where people can sign up for health insurance under the Affordable Care Act, has been under fire since its launch due to both technical and registration issues that have led to rancor between Congress, President Obama, and citizens trying to use the site. DelBene, who retired earlier this year after serving as president of Microsoft's Office division, will replace Jeff Zeints at HealthCare.gov, and has said he will stay in his role until at least the end of the first half of 2014.