Messaging policy and compliance features are enhanced by or are also available as services from Microsoft Exchange Hosted Services. Exchange Hosted Services is a set of four distinct hosted services:

• Hosted Filtering, which helps organizations protect themselves from e-mail-borne malware
  
• Hosted Archive, which helps them satisfy retention requirements for compliance
  
• Hosted Encryption, which helps them encrypt data to preserve confidentiality
  
• Hosted Continuity, which helps them preserve access to e-mail during and after emergency situations
  

These services integrate with any on-premise Exchange servers that are managed in-house or Hosted Exchange e-mail services that are offered through service providers. For more information about Exchange Hosted Services, see Microsoft Exchange Hosted Services.