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

That's the same advise I gave my user, to use web mail.

Odd thing:

We have 8x late 2015 iMAC. One of those devices was purchased one year after the others. That's the one that is having this problem!

Something was changed in this later production batch.

IMHO, buying a new iMac is a waste of money simply due to having to run Outlook in low-resolution. The loaded i7 late 2015 iMacs in my department are still really nice.

When I was trying to source the problem (which I spent way too much time on), I took one iMac home when I was checking any issues with power or network interference, and wow, I could have kept it! They're super fast with a beautiful display. Great thing about Macs is how long the last! I actually only budget to replace Macs in my department every 5-6 years.

Another option, if you have a Mircosoft account, you can still use Outlook webmail. Their webmail is better then it use to be. Login: https://outlook.office365.com.

Guys,

A bad news, right after I sent out this message, the problem happens again!

Therefore, please do not have to remove your profile, it does not work.

Pitman

I think one has to resign yourself to the fact that the issue will remain and there is no fix for anyone with a late 2015 unless MS  resolves for all

I have heard and can think of only four alternatives :

• If you are really that intent or have to use Outlook buy a new iMac other then a late 2015 and your problem will be solved and you can get on with life ( in any event 4 years is about the lifespan of a computer- your late 2015 Mac will then be "late" in the true sense of the word ??????  ) ;
• Reduce resolution which is a terrible option and a waste if you have a 5k display;
• Increase resolution to  Display>Scaled >More space in System Preferences - someone posted they did this but have not seen feedback if a successful fix;
• Use Apple Mail if you are able.It works Oh, so well and no frustration once you have sort of mastered the quirks  after Outlook.

Until then I see MS opened a ticket to fix

Who knows maybe when Catalina launched this could be by default or by chance fixed ...maybe someone with the expertise can download Catalina Beta and check it out ???  

Notwithstanding all and any posts , this is whether we like it or not ,we are with the options !

Guys,

A bad news, right after I sent out this message, the problem happens again!

Therefore, please do not have to remove your profile, it does not work.

Pitman

Guys,

I have a solution but perhaps more user have to verify it. I am using Outlook version 16.28 (19071506). I have removed my old profile (The user) and then I create a new one. So far, I have been using for the whole morning and it is ok. 

All victims, please have a try and see if you have any new findings.

Pitman