Microsoft Corp. today took the unusual step of issuing security updates to address flaws in older, unsupported versions of Windows — including Windows XP and Windows 8. The move is a bid to slow the spread of the WanaCrypt ransomware strain that infected tens of thousands of Windows compu...

Microsoft Corp. today took the unusual step of issuing security updates to address flaws in older, unsupported versions of Windows — including Windows XP and Windows 8. The move is a bid to slow the spread of the WanaCrypt ransomware strain that infected tens of thousands of Windows compu...