WINONA, Minn. – A caller, claiming to be from Microsoft, told a Winona pensioner that her online account had been flagged as unprotected and also for pornography traffic. The woman, age 75, was distressed. As requested, she provided financial information to the caller to remove the flags. Yes, it was a scam. Before the woman realized what was happening, she had lost $13,000 in bitcoin savings in two transactions. Police, who were informed about 9:30 a.m., said bitcoin scams are hardly ever possible to track.