Tag: can’t open New Outlook

New Outlook Not Launching or Opening

| July 31, 2026

New Outlook Not Launching or Opening

I took a call today from a client who loves New Outlook but it would not launch at all. I checked for the usual suspects like AV/VPN and those weren’t the issue.

I decided to dig deeper and when into the program files and found a small file that looked suspicious to me, not sure if it was the file or not that was not working. The file was “olk-launchevent-host.win32.bundle” and then I searched for that and found the fix below that did launch New Outlook again. I hope this works for you. If not, reach out using the form below and I’ll see if I can help.

The olk-launchevent-host component in the New Outlook/Office architecture fails to launch due to local state corruption, bad authentication cache tokens, or a blocked background JavaScript resource. [1, 2]
Clearing Local State and Cache
  • Close Outlook and all related Microsoft apps (like Teams or Word) completely.
  • Press Windows Key + R to open the Run dialog box.
  • Type olk.exe --clearLocalState and press Enter to clear the app state.
  • Reopen Outlook and check if the launch event host processes successfully.