Running Outlook on the iMac causes the screen to flicker and eventually black out and reduce to half/split screen display.

Hi! I spent a lot of time w/Apple Support and they directed me here. Having the same problem w/my iMac 27". This started after the update sent through from Microsoft on about 5/17/19. I've used Outlook for years and not happy to switch but will have to if they don't fix this. Basically I have to quit Outlook after I view my mail which is really a pain. If I don't keep it open, then my computer behaves just fine.

Since I "rent" MS Office annually, don't know how to go back to version 16.23 which I understand is more stable. Does anyone know? Thanks.

Not only is this a problem of user experience, it’s a health issue in my view so I suggest this is dealt with very urgently or some kind of warning is published.

No chance. Microsoft is a horrible customer unfriendly company. I tried to contact them directly and via Twitter. They didn't even replied.

I have come to this conversation due to having the same issue.  I have the same hardware as others in this thread and I think it has been obvious that this is a software bug for a long time.

One thing I would like to point out is that, in my experience, the screen flickering happens without any warning and does not relate to any particular action or set of actions. It is also quite dramatic so I wonder if Microsoft has considered the potential risk to people who may be adversely affected by flashing images?

Not only is this a problem of user experience, it’s a health issue in my view so I suggest this is dealt with very urgently or some kind of warning is published.

We are also having what appears to be the same issue with 2 of our iMacs.  Both 27"5K Late 2015 models that flicker intermittently and sporadically.  When the issue happens the user has to force shutdown.  The issue disappears for a few days then returns. 

We use Outlook heavily here.  We are part of a wider group of companies that has heavily invested in Office 365 and the host of apps that come with it.  Outlook has been working fine for the most part.  We have tried clean installs on the two computers but the issue persists. Apple Genius Engineering Team could find no Hardware faults and summised software was the cause.  The only programs that the 2 users always have open are Safari and Outlook. 

We will see whether the issues occur without Outlook, but our users won't be happy as Outlook is integral to the way they work. 

Please  update if a fix/patch is found/released.

Your description typical what occurs.

As an individual business owner not reliant on Outlook and have moved to  Apple Mail ....no issues now and my Mac has never been this well behaved and  fast!!

We are also having what appears to be the same issue with 2 of our iMacs.  Both 27"5K Late 2015 models that flicker intermittently and sporadically.  When the issue happens the user has to force shutdown.  The issue disappears for a few days then returns. 

We use Outlook heavily here.  We are part of a wider group of companies that has heavily invested in Office 365 and the host of apps that come with it.  Outlook has been working fine for the most part.  We have tried clean installs on the two computers but the issue persists. Apple Genius Engineering Team could find no Hardware faults and summised software was the cause.  The only programs that the 2 users always have open are Safari and Outlook. 

We will see whether the issues occur without Outlook, but our users won't be happy as Outlook is integral to the way they work. 

Please  update if a fix/patch is found/released.