Learn more about password requirements for Office 365 mailboxes

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The following rules and restrictions apply to passwords for Office 365 mailboxes:

  • Passwords must be at least eight characters long.

  • Passwords can have a maximum of 16 characters.

  • Passwords can’t contain the user's account name or parts of the user's full name that exceed two consecutive characters.

  • Passwords must contain characters from three of the following four categories:

    • Uppercase letters (A through Z)

    • Lowercase letters (a through z)

    • Numbers (0 through 9)

    • The following non-alphabetic characters: ` ~ ! @ # $ % ^ & * ( ) _ + - = { } | [ ] \ : " ; ' < > ? , . /