I have added SP 2010 custom list to outlook 2007 afterthat I slect one email and move to that list and got below error

An error has occurred connecting to the license server.

Error: The request failed with HTTP status 404: Not Found.

Application: System.Web.Services

Method: System.Object[] ReadResponse(System.Web.Services.Protocols.SoapClientMessage, System.Net.WebResponse, System.IO.Stream, Boolean)

Stack Trace: at System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall)

at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters)

at Lists.GetListCollection()

at Scinaptic.OnePlaceMail.API.ClientIntegration.OPMServerSP2007.b(String A_0)

at Scinaptic.OnePlaceMail.API.ClientIntegration.OPMServerSP2007.GetServerListFromListUrl(String listUrl)

at Scinaptic.OnePlaceMail.API.ClientIntegration.OPMLicenseServer.GetLicenseXml()

at Scinaptic.OnePlaceMail.API.ClientIntegration.OPMServerSP2010.GetUserLicense(String serviceUrl, String libraryUrl)

at Scinaptic.OnePlaceMail.API.ClientIntegration.ItemProperties.SetCurrentFilingLocation(OPMServer opmServer, OPMLibrarySettings librarySettings, String listUrl, String folderUrl, Boolean isSubFolder, String listID)

I close the error message after I select metadata column item value in properties. I can't click save button. The save button is not highlighted.

I need above requirement is urgent, can you give some solution on above error.