Thanks for all the posts everyone, this seems like the issue I am having. The really odd part is that I am seeing TWO copies of the emails in my inbox when I go to webmail. So, while I am getting two copies of random emails via POP, there really are two emails on the server! Running SM Enterprise Edition Version 12.5.5409. I have Outlook 2016 all updates in place (my version is beyond the one they stated is the correct one (I am on 16.0.6769.2017 and the one that fixed is was 16.0.6568.2036).
Anyone else seeing the same issue? Any thoughts would be appreciated. Not critical stopping my use of email, just really annoying to think you are seeing things and replying to people twice! ;)
Thanks in advance,