Can't connect to Outlook via TOutlookApplication component

Hi,

One of our customers has a problem with synchronizing scheduler events from Outlook to our application.
Customer PC details: Windows 10, Outlook 2010.
Our application uses component "TOutlookApplication" to connect to Outlook.
When connecting to Outlook the user is asked to close Outlook before starting sync.

procedure TForm1.btStartImportClick(Sender: TObject);
var Calendar: MAPIFolder;
      NmSpace: NameSpace;
begin
  try
    appOutlook.ConnectKind := ckRunningOrNew;
    appOutlook.Connect;
    try
      NmSpace := appOutlook.GetNamespace('MAPI');
      NmSpace.Logon('', '', False, False);
      Calendar := NmSpace.GetDefaultFolder(olFolderCalendar);
      ProgressBar1.Max := Calendar.Items.Count;
    except
      On E: EOleException do  // uses ComObj
      begin
        E.Message := FullOleExceptionMessage(E);
        ShowMessage(E.Message);
        Exit;
      end;
    end;
  finally
    appOutlook.Disconnect;
  end;
end;

The error which is given:

Cannot connect to MS Outlook server is unavailable
Error code: -2147221231 80040111
Facility: ITF code: 4

Does anybody have an idea how this can be solved?