You must remove from registry the bellow value: Microsoft Word previewer: HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{84F66100-FF7C-4fb4-B0C0-02CD7FB668FE} Microsoft Excel previewer: HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{00020827-0000-0000-C000-000000000046}
NOTE: You must Run As Administrator Exchange Shell Console OR PowerShell connector to exchange 365 To look what permissions are set on Calendar item Get-MailboxFolderPermission...
Open Registry Editor From start menu or open "RUN" and type regedit.msc and go to this path from Registry Editor Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate If value for DisableWindowsUpdateAccess...