Outlook 2013 Connectivity Issues with Office 365 (HSRESULT:0x80040115)

Assessing the Problem 

For months, I have been battling connectivity issues with Exchange Online from home. My Outlook seems to function fine at work, on wifi tether, but when I get home, the connectivity is unstable. Some of the symptoms I’ve been seeing are:

  1. Message stuck in outbox
  2. Frequent Sync Errors
  3. No messages coming into inbox, then all of a sudden a stream of messages come in

Some of the sync errors I experienced look like: 

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