Outlook 2016 not receiving deletions or changes from Exchange 2010

Issue: Mail changes not filtering down to two separate Outlook 2016 installations
When the end user deletes or changes mail messages on his I-phone or Outlook 2013 laptop the said changes never make it to his remaining computers with Outlook 2016 installed. The changes however are replicated to the Outlook 2013 install

All computers are running in Outlook cached mode.
The .OST files have been removed and recreated
Exchange 2010 is the mail server.
This is the only user affected
joelahaleAsked:
Who is Participating?
 
Lisa Hendrickson "CallThatGirl"Connect With a Mentor MS Outlook ExpertCommented:
Your answer is probably in your question :) I would downgrade the user to 2013, unless for some odd reason they absolutely have to have 2016?
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Lisa Hendrickson "CallThatGirl"MS Outlook ExpertCommented:
Closing due to inactivity and I gave the only answer and I believe the best solution.
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