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Calendar Overlays and Exchange 2010

Posted By:      Posted Date: September 08, 2010    Points: 0   Category :SharePoint
I'm  trying to setup a Calendar Overlay with Exchange on my project calendar.  I can browse the OWA URL and the Exchange Web Service  (.asmx) in Internet Explorer without any errors.  Both URLs use https and are third-party signed.  After I inupt the URLs into the Overlay config screen and save, Sharepoint attents to retrieve the calendar information and throws the follows error: "Could not establish trust relationship for the SSL/TLS secure channel with authority" on the calendar screen. Any ideas?

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I've created one Inbox and one Calendar wepbart as descibed here:


using  OWAInboxPart and OWACalendarPart (code below).

When deploying them and placing them on the same page, only one of them will show anything. It looks like the last added webpart works, while the other won't.
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Best regards,
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Inbox wp:

using System;
using System.Runtime.InteropServices;
using System.Web.UI;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Serialization;

using Microsoft.SharePoint;
using Microsoft.SharePoint.WebControls;
using Microsoft.SharePoint.Portal.WebControls;
using Microsoft.SharePoint.WebPartPages;

namespace Inbox
    public class fmno_Inbox : System.Web.UI.WebControls.WebParts.WebPart

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