7:30AM Pacific — A recent change within Office365 has created issues in the way that their system handles certain HTML emails, including some of our junk mail digests.  We have confirmed that the digests are leaving our system intact and readable, and no recent changes have been implemented in our digest code, but the O365 system appears to be having trouble rendering some of those emails correctly.  To our knowledge this is not affecting any other mail provider.

We are in in the process of investigating this in more detail and are contacting Microsoft as well.  We will post further updates here.