Problem
When starting the modern Office add-in, it immediately fails with error "Access is denied".
The issue is an corrupt IE localStorage that is necessary to run our add-in. Should only happen on Outlook for Windows or Outlook for Web when using Internet Explorer.
For advanced users, a lot of background information to the issue can be found here: https://stackoverflow.com/questions/13102116/access-denied-for-localstorage-in-ie10
Solutions
we have two ways here Clear Registry Cache and Set integrity level are recommended.
There might be different reasons for the issue, so please try the following steps one by one and check if it is working again
Solution: Clear Registry Cache
Close Outlook
Open Windows registry with tool regedit (Help)
Open the following tree path:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\5.0\LowCache\
Delete the whole key "Extensible Cache" including all subkeys
Open the Cache folder
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\5.0\LowCache\
Delete the whole key "Extensible Cache" including all subkeys here too
Restart Outlook and check if it is working
Solution: Set integrity level
Close Outlook
Open a command line - cmd (make sure to not run as administrator)
Run the following command to set the integrity level for the AppData/LocalLow correctly to "Low"
icacls %userprofile%\Appdata\LocalLow /t /setintegritylevel (OI)(CI)
Restart Outlook and check if it works.