ET- Job openings fall less than expected- Microsoft falls on UBS rating downgrade- Indexes mixed: Dow down 0.11%, S&P up 0.01%, Nasdaq down 0.25%Jan 4 (Reuters) - Wall Street's main indexes were subdued on Wednesday as data showed U.S. job openings fell less than expected, fuelling investor anxiety about interest rate hikes ahead of the Federal Reserve's December meeting minutes.A survey from the Labor Department showed job openings fell 54,000 to 10.458 million on the last day of November, compared with expectations of 10 million job openings.Meanwhile, Apple Inc (AAPL.O) rose 0.6%, while electric-vehicle maker Tesla Inc (TSLA.O) jumped 2.3%, with both the shares recovering from a searing drop in the previous session.Microsoft Corp (MSFT.O) dropped 5.2% following a downgrade by brokerage UBS on worries over slowing growth for its cloud services and Office suite.The Fed minutes could show the central bank's internal deliberations entering a new phase where risks to economic growth and employment are given more standing, while curbing high inflation remains the top priority."