The administration and maintenance of Microsoft Exchange Server to ensure secure, reliable, and efficient email and collaboration services across an organization.
Hello William,
I understand that you've reinstalled Outlook and are trying to add your existing Exchange email account, but Outlook reports that your password is invalid. You'd like to reset your password so you can reconnect your mailbox. Before resetting your password, let's check whether you can sign in to your email account using a web browser.
1/ Check your current password
- Open Outlook on the web.
- Enter your full Exchange email address and current password.
- If you can access your mailbox, your password is working. Try adding the account to Outlook desktop again.
- If you receive an invalid-password error, proceed with the reset options below.
2/ Reset your password
Visit the Microsoft password reset page.
- Enter your email address.
- Follow the identity verification instructions.
- Create a new password if the reset option is available. Reference: Change your Microsoft account password
If the reset option is unavailable, contact your Microsoft 365 administrator to reset your password:
- Sign in to the Microsoft 365 admin center.
- Go to Users > Active users.
- Select your email account.
- Select Reset password.
- Generate a temporary password and share it with you securely. Reference: Reset passwords in Microsoft 365 for business
Once your password has been reset, use the new credentials to add your account to Outlook again.
If this answer helps, please click Yes to indicate that your question has been answered. If you have additional questions, click Comment.