Based on the following: http://blogs.technet.com/b/exchange/archive/2006/10/26/3395220.aspx, I want to have a public folder in Exchange 2007 that is used as a shared company calendar appear in a portlet. Ex.: http://<exchangeserver>/owa/ae=Folder&t=IPF.Appointment&id=PSF.<id>&part=1 The URL works fine in a browser window, but when I embed the url in a iframe (necessary for insertion into a portlet) For Example: <iframe width=100% height=400 frameborder=0 src=<url></iframe> I get an error identical to one reported here: http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/Q_26784763.html Why the different behavior when embedded? Note that everything displays correctly and functions great but I am getting an error box every time the page loads. I can click close on the error box and the calendar works normally. The error doesn't seem to be preventing anything that I can tell.