Microsoft recently announced that it will be changing its vacation policy for employees in the US to provide unlimited paid time off, which is a policy already in effect at LinkedIn and Netflix. This decision was made in an effort to increase work flexibility and will make it easier for the company to administer time off. However, there are some fears that such a policy may conflict with managers' expectations and make it more difficult for employees to take adequate vacation time.
See "Microsoft announces new workplace policy guaranteeing unlimited paid time off for its US employees", Dina Bass, Bloomberg, January 11, 2023