1. Open Outlook
2.Open a web browser and sign into the SharePoint Site.
3.Navigate and display the calendar.
4.Click the Calendar tab at the top of the page to display the action ribbon.
5. On the ribbon, select the option to, Connect to Outlook. A Launch Application dialog box will show, you may have to click Allow or "Navigate Away from this page", depending on the browser (Firefox, Internet Explorer, or Chrome) you are using. Select Microsoft Outlook, click OK. A message on Outlook displays, "Connect this SharePoint Calendar to Outlook?"
6. Click, Yes.