Details
Requiring users to include non-numeric characters in their passwords increases the strength of password security in your organization.
Rationale:
Not requiring alphanumeric passwords can make it easier for an attacker to correctly guess them.
Solution
To implement the recommended state, execute the following PowerShell cmdlet:
Set-MobileDeviceMailboxPolicy -Identity Default -AlphanumericPasswordRequired $true
Supportive Information
The following resource is also helpful.
This security hardening control applies to the following category of controls within NIST 800-53: Identification and Authentication.This control applies to the following type of system Windows.