My outlook data-file had some problems, so I downloaded a recovery repair application from Microsoft website. I don’t remember the name of the app, it was used for troubleshooting the data-file problem. After running the app, even though the problem was not solved it asked if want to send some log files. I said okay.

That was a mistake, from next day onward my C drive space got reduced super fast. When I analysed the file size with TreeSize application, I found that there is a 98 GB log file on %temp% folder related to outlook. Wow!!

C:\Users\<user name>\AppData\Local\Temp. in this location. I deleted the log file, now my system storage is returned. But next day this file appeared again. So how to solve this problem.

After some research i found the following solution. To resolve this issue, follow these steps:

1. Exit Outlook.
2. Open a Run dialog box. To do this, use one of the following methods, as appropriate for your situation:
   • Windows 10, Windows 8.1 and Windows 8: Press Windows Key + R.
   • Windows 7 or Windows Vista: Click Start, and then click Run.
3. Type regedit.exe, and then click OK.
4. Locate and then click the following subkey:HKEY_CURRENT_USER\Software\Microsoft\Office\x.0\Common\Debug
   
   Note The x.0 placeholder represents your version of Office (16.0 = Outlook 2016, Outlook for Office 365 and Outlook 2019, 15.0 = Outlook 2013, 14.0 = Outlook 2010, 12.0 = Outlook 2007).
5. Right-click TCOTrace, and then click Delete.
6. When you are prompted to confirm the deletion, click Yes.
7. On the File menu, click Exit to exit Registry Editor.
8. Delete the Outlook.exe.log file from the %Temp% folder if you are not working with a Microsoft support engineer on an issue.