Access is denied

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:

CODE

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\5.0\Cache\

Delete the whole key "Extensible Cache" including all subkeys

Repeat the same with the LowCache folder:

CODE

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"

CODE

icacls %userprofile%\Appdata\LocalLow /t /setintegritylevel (OI)(CI)L

Restart Outlook and check if it works.