// get a handle of Outlook App and enable standard additions
outlook = Application("Microsoft Outlook");
outlook.includeStandardAdditions = true

//get the first selected message
selectedMessage = outlook.selectedObjects()[0];

//copy message id to clipboard
outlook.setTheClipboardTo("" + selectedMessage.id())

// this part is for future
//todoist = Application("Todoist");
//todoist.activate();

// open message by the id retrieved from clipboard
outlook.open(outlook.incomingMessages.byId(outlook.theClipboard()))