>Hi,
>
>I have noticed that the CPU usage of my PC (Windows 7 Pro with 16 GB ram) goes up whenever I start replying to an email. And the longer I reply (or stay in the Reply mode) the higher the CPU until the entire Outlook stops responding. And then I have to close Outlook. As soon as I close it, the CPU goes down.
>
>What could be causing CPU to go up when replying?
>
>UPDATE. Another thing I noticed in Task Manager. When I open Outlook, it's memory is no more than 80K. As soon as I click on Reply (to any message), the CPU jumps up from 0 to 20 or 25 right away. The Memory starts growing very fast. I had to cancel Reply when the memory was 196K. So far, Googling for this specific issue didn't produce a solution.

I am pretty sure now that the problem has to do with the specific Outlook.pst file. On this computer (where I am typing this message) I have the same Office 365 and Outlook installed. And when I would start Outlook (up until 1/2 hour ago) I never had a problem with memory leak.
Then now that Avast completely f*cked up my "main" computer, I need to temporarily move files from "broken" computer to this one. I copied the Outlook.pst from the "broken" computer to this one and now when I open Outlook 365 on this computer and click on Reply to any message, the memory leak starts.