Microsoft delayed its office return indefinitely, it said in a blog post on Thursday. The company had pushed the full reopening of its U.S. offices to no earlier than Oct. 4., but revised those plans because of the threat of the Delta variant of the coronavirus. “It’s a stark reminder that this is the new normal,” wrote Jared Spataro, Microsoft’s corporate vice president for modern work. “Our ability to come together will ebb and flow.” The company has said it will require proof of vaccination for all employees, vendors and guests to enter its offices.