I forgot Exchange password

Exchange is a Microsoft product, you should be in touch with Microsoft to see if they have a "Forgot My Password" link for Exchange.

Also, you can look in KeyChain which is pre-installed on your computer to see if you can find your Exchange password. Simply hold down Command and Spacebar and type KeyChain and. you can find the app. To learn how to use KeyChain click Manage passwords using keychains on Mac - Apple Support

Finally, you really should be using a password manager to manage all the logins and passwords you have to use. Personally I used one called 1Password which works on all OS's and platforms, got to 1Password.com to learn about it. There are also many other password managers, available I just happen to use 1Password.

No one here knows it either. If your Exchange mail is by means of a corporate account, or a service provider, ask the IT organization for help with resetting your password.