If you are installing the Outlook Client for Dynamics CRM 2011 Online, you may be confused by a question you'll be asked – Server URL. Unsure what to enter here? Good news – you don't have to enter any URLs. As per the screenshot below, simply click the dropdown box arrow and you can select "CRM Online" as an option. Now your Server URL will say "CRM Online". From there you can click Test Connection and proceed with the installation.
No need to find any URL for your CRM environment. Easy!