I am investigating to add a calendar overlay from my exchange 2003 account at SharePoint 2010. It does not appear to work properly. It asks for a WebService URL and as I understand there is NO EWS web service for Exchange 2003. Is there a way out? Or we are left with upgrading the Exchange to 2007 or 2010? Any input is appreciated.. Regards from Venkat

Hi, It does not work on exchange 2003. You have to use EWS web service which is only available in exchange 2007/2010.Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. Thanks Gen Lin-MSFT

Thanks Gen for your feedback. Is it possible to wrap WebDav of Exchange2003 as a web service like EWS and consume from SharePoint 2010? If so, what is the contract, for EWS, so that we can mimic EWS? (This may be a stop gap till Exchange upgrade takes place) Suggestions?