Below are a few links I’ve used relating to Office 365’s Office Message Encryption (OME):

1. OME – steps for purchase, Configuration, Branding and Use (Everything you need to know)
   • http://blogs.technet.com/b/compilations/archive/2014/04/30/office-365-message-encryption-amp-decryption-steps-for-purchase-configuration-branding-and-use-everything-you-need-to-know.aspx#.VZ1bnLDbKM9
2. Introducing OME
   • http://blogs.office.com/2013/11/21/introducing-office-365-message-encryption-send-encrypted-emails-to-anyone/