>>>>Since the memory leak starts as soon as I click on Reply, I was wondering if I can "catch" the service that kicks in on Reply. I look in the Task Manager and see many services running. If I could get them into a report and then get them again into report, after clicking on Reply, it could point to the culprit. Does anyone know how to get a report of all Services in Task Manager?
>>>
>>>From a command box you can run

>>>tasklist /svc >serviceslist.txt

to get a list of running services. You might even compare the machine that's showing the problem with the one that runs OK.
>>
>>Thank you very much.
>
>Not sure whether you'd catch it among services. It's also possible that it's something that runs as a process, i.e. an app which doesn't have its own desktop window so it doesn't show in the taskbar. There's probably a similar switch for showing processes.
>
>You may be better off with process explorer by Mark Russinovich (Rusinović?) - https://technet.microsoft.com/en-US/sysinternals

Thank you for your input. Frankly I am tired of dealing with MS Outlook 365 issue. I believe it is something with what Outlook 365 does when you click on Reply. It just starts leaking memory big time. I asked the question on MS Community and MS Support Engineer gave me a useless suggestion (short of "reformat your drive and try again"). I am convinced that MS will never resolve this issue. And I need to move on with my work. I have never had problems with Outlook 2010 before and now willing to shell out another $300 for it just to get over this problem. I think of this as a lesson to never buy new MS products.