Nokia Oyj is offering voluntary retirement at an Indian factory at the centre of a tax dispute after a review of the regulatory environment in countries where it operates. Nokia planned to transfer the plant to Microsoft Corp as part of the 5.4 billion euro ($7.5 billion) sale of its handset division, but the local tax office seized it last year. A court later ordered Nokia give the tax office a 35 billion rupee ($582.17 million) guarantee before transferring the plant to Microsoft.