The AddIn 'gpg4o' newly developed by Giegerich & Partner was designed for utilization with Microsoft Outlook 2010 ® and offers all important functions of the OpenPGP encryption system and other features such as e.g.:

• Encrypting and decrypting E-mails (plain-text and HTML)
  
  
• Receiving PGP/MIME E-mails
  
  
• Support of GnuPG 2.0
  
  
• Automatical search for updates
  
  
• Installation of updates via the Internet
  
  
• Signing and verifying of digital E-mail signatures
  
  
• Key management
  
  
• Signing of external keys
  
  
• Web of Trust (checking the validity of external keys by means of information of known key owners)
  
  
• Encrypting and decrypting as well as signing attachments
  
  
• Key exchange with key servers