Sonntag, 25. November 2018

Office 365 Message Encryption (OME) vs. Azure Information Protection

Main difference from a security perspective is, that OME is encrypting the transport and not the attached content over its lifetime.
All feature like IRM, AIP and OEM are based on the Azure RMS Service. The overall architecture looks like this:

Comparison of OME, IRM, and new OME capabilities


  • If you want to protect documents attached to an E-Mail only on the transport layer or if you want to use the “Do not forward” feature OME is the way to do it.
  • If you want to protect the document also after the E-Mail is received and the document is downloaded etc. then you need AIP.

Bothe features are good to protect E-Mails and attachments for internal use and for sharing them with externals. In OME you can send protected E-Mails to external receptions with out configuring anything special. The recipients received an HTML message that they downloaded and opened in a browser or downloaded mobile app:
To make the functionally available with AIP you need to add the external domain to you AIP label:

Protecting an E-Mail with AIP or OME in Outlook



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