The default Exchange and Exchange Online mobile policies do not enforce PIN/passwords for mobile devices, which is not recommended for security reasons.
In Exchange Server and Exchange Online the default mobile device mailbox policy allows non-provisionable ActiveSync devices to connect, which is not recommended for security reasons.
A recipient not found exception warning may appear when issuing a remote wipe for a mobile device in the Exchange Admin Center.
Get started with the built-in mobile device management capabilities of Office 365, and learn how to plan and deploy MDM for your organization.
Microsoft has announced Exchange ActiveSync V16 with new calendar reliability, attachment sync, and drafts support.