Office 365 Password Expiration Policy

This topic applies to Office 365 Enterprise, Office 365 Business Essentials or Office 365 Business Premium.

User passwords expire on a regular basis in Office 365. Global and delegated admins can make the user’s password expire after a certain number of days or set the password to never expire. Admins can also change the number of days before users are notified of password expiration.

  1. Sign in to Office 365 with your work or school account.
  2. Go to the Office 365 admin center.
  3. Go to Service settings > Passwords.
  4. If you don’t want users to have to change passwords, select Passwords never expire. If you select this option, users won’t get any reminders anymore to change their passwords.
  5. If you want user passwords to expire, type the number of days before the password should expire. Choose a number of days from 14 to 730.
  6. Type the number of days before users are notified that their password will expire, and then click Save. Choose a number of days from 1 to 30.

See Microsoft Office 365 Support page