The new policy will be phased in over the next 12 months and is believed to affect thousands of workers.

To qualify for contracts, companies will have to provide at least 12 weeks of paid time off, up to $1,000 a week, at the birth or adoption of a new child. The policy will apply to companies with 50 or more workers who perform “substantial” work for Microsoft. The requirement will be phased in over the next 12 months and is expected to impact thousands of workers.

“Companies like us are in a unique position to create positive impact within our broader ecosystem,” said Microsoft General Counsel Dev Stahlkopf. “We’d like to focus our resources on companies that share our values.”

Only 13 percent of private-sector workers in the U.S. get paid parental leave. As Microsoft improves its own benefits, the company has also been trying to raise the standards for its subcontractors.

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