问题 I wish to execute a URL in the format mapi://{S-1-5-21-1626573300-1364474481-487586288-1001}/toto@mycompany.com($b423dcd5)/0/Inbox/가가가가곕갘객겒갨겑곓걌게겻겨곹곒갓곅갩갤가갠가 , which I got from searching via Windows Desktop Search. On Vista with Outlook 2007, this fails to open Emails if outlook is already open. Except sometimes, when it works for mysterious reasons. Below are some things I've tried in an attempt to get this to work: Executing it with Process.Start , or executing it with Process.Start via cmd