Execution Policy

Execution Context

Restricted

Users can issue commands at the PowerShell prompt but can't call scripts.

AllSigned

Users can run scripts, but the scripts and any configuration files must be signed by a trusted publisher.

RemoteSigned (default for Exchange Management Shell)

Users can run scripts. Scripts and configuration files that are downloaded from communications applications such as Microsoft Outlook, Outlook Express, Microsoft Internest Explorer, and Windows Messenger must be signed by a trusted publisher.

Unrestricted

Users can run scripts. Scripts that are downloaded from communications applications can be run after the user acknowledges that this content may be dangerous; no signature is required.