WASHINGTON: Microsoft said on Wednesday (Aug 20) it has scaled back some Chinese companies' access to its early warning system for cybersecurity vulnerabilities following speculation that Beijing was involved in a hacking campaign against the company's widely used SharePoint servers. The new restrictions come in the wake of last month's sweeping hacking attempts against Microsoft SharePoint servers, at least some of which Microsoft and others have blamed on Beijing. That raised suspicions among several cybersecurity experts that there was a leak in the Microsoft Active Protections Program (MAPP), which Microsoft uses to help security vendors worldwide, including in China, to…