All encryption will be now done with PGP.

Decrypting the Guard 1.0/1.2 proprietary methods is still supported. Encryption with Guard 1.0/1.2 proprietary methods is no longer supported.

With the change to PGP, email expiration date, status or read/unread emails, and retracting is no longer
supported.

Sharing files within the context by adding multiple keys is no longer supported. PGP encrypted files are specific to the user only PGP

PGP Mime and PGP Inline is now fully supported.

Guard is now able to act as a hkp compliant PGP Public key server