Looks like a memory resource leak and needs fixing ASAP I can only hope the semi annual channel gets an update released on patch Tuesday Anyone have good enough level support with MS that they will look at a dump file taken when Outlook is flashing What s the version of the Windows system I am trying something else by going into power options Advanced Power options and Intel has its own header I am going to try to set it to high performance rather then balanced Your understanding and patience will be appreciated You can look up the values in the Object Browser in the Visual Basic Editor in Outlook Thank you for getting back to me Admitted it did have different marketing content Have you tried vmmap to review the virtual memory when the issue occurs i have tried some shot gun fixes Setting the intel power settings to high performance didn t do anything I have Evernote Box for office ESET and Mimecast Several addins installed in Outlook I am going to get that box unticked again and see what happens I have no time for uninstall reinstall upgrade and all the other ridiculous suggestions to troubleshoot this but at least wanted to share this information because it s clear upgrading to 69 bit is not a fix removing certain Add ins is not a fix changing machines is not a fix I m using win 7 69x and did not reboot Windows 7 x69 with Office 7568 x86 Such as Nvidia screen capture or OBS etc Outlook behaving fine and I get a HTML formatted message https://infolast.ru/q/22 screwfix com I have a same issue that Outlook start flickering I am actually just removing Mimecast from my troubled users for the next few days this issue has bombarded me these last few days Based on my experience I d like to recommend trying the safe mode at the user s convenience to help troubleshoot the problem Hi Blue Craig We will give it a go The flashing in Outlook 865 started with the most recent Windows 65 Updates also started signing out every 5 minutes but that is another issue