Hello,
since build 2105 and still also in build 2110, Outlook.exe causes high CPU load each time after opening an attachment:
- Approx. 1 minute after an attachment was opened (for example a CSV, XLS or DOC file) and watched in an external application as Excel, Word or others, the task Outlook.exe starts fully using one CPU core for 2-3 minutes.
- Apart from the CPU load, according to Windows task manager Outlook.exe neither uses SSD/HDD nor memory nor network. So it's not clear what it does.
- The CPU load immediately stops as soon as you go back to Outlook.
- I was able to reproduce the problem on different PCs (all with current Windows 10 + Office/Microsoft 365).
- Sometimes, it takes some time until this strange behaviour starts and several applications have to be opened together with Outlook. But as soon as it happens for the first time, it comes back repeatedly each time you open an attachment and watch it in a different application than Outlook.
- When you revert Office to build 2104, the problem no more appears.
The Outlook in-app support could not really understand nor help, but finally just stated this behaviour would be new and normal, without telling for what it is and what happens.
Can anybody confirm this problem?
