Hi,I have three sites(A, B and C). My mailbox is on A and I am trying to see F/B of user hosted in mailbox server which is site C but it is failing with below error. Any idea what does this error indicates? Please note that I am able to open Site C mailbox from SiteA without any issues and also able to view F/B of my mailbox from SiteC mailbox using a desktop in SiteC.Event Type: ErrorEvent Source: MSExchange AvailabilityEvent Category: Availability Service Event ID: 4018Date: 10/5/2009Time: 3:46:01 PMUser: N/AComputer: MAILSITEACAS1Description:Process 956[w3wp.exe:/LM/W3SVC/1/ROOT/EWS-1-128982684182343750]: An exception occurred while attempting to locate a Client Access server to handle a request for e-mail address <sitecmailbox1, Mailtwo>SMTP:EMAIL REMOVED. The returned exception is Microsoft.Exchange.Data.Storage.ServerNotFoundException: The server siteCmbx2.mydomain.com was not found in the topology. at Microsoft.Exchange.Data.Storage.ServiceTopology.GetSite(String serverFullyQualifiedDomainName) at Microsoft.Exchange.Data.Storage.ServiceDiscovery.FindServices[T](ServiceTopology topology, String mailboxServerFQDN, ClientAccessType clientAccessType, AuthenticationMethod authenticationMethod, Boolean& isServiceOnCurrentServer) at Microsoft.Exchange.Data.Storage.ServiceDiscovery.FindServices[T](ExchangePrincipal mailboxUser, ClientAccessType clientAccessType, TimeSpan getServiceTopologyTimeout, Boolean& isServiceOnCurrentServer) at Microsoft.Exchange.InfoWorker.Common.Availability.QueryGenerator.FindIntraForestEWSEndPoint(EmailAddress emailAddress, ExchangePrincipal principal, ServerVersion minServerVersionToMatch, ServerVersion maxServerVersionAllowed) at Microsoft.Exchange.InfoWorker.Common.Availability.QueryGenerator.HandleIntraForestMailbox(EmailAddress emailAddress, ADUser recipient). For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. Thanks, Sitaram www.sitaram-pamarthi.com

Please take a look @ below http://www.microsoft.com/technet/support/ee/transform.aspx?ProdName=Exchange&ProdVer=8.0&EvtID=4018&EvtSrc=MSExchange+Availability&LCID=1033 http://msexchangeteam.com/archive/2006/10/23/429296.aspx Run exbpa on affected server also Please fallow below steps on problematic user's client computer to check client is able to connect autodiscover services successfully. 1). Open the Outlook client 2). Hold down the CTRL key on your keyboard and click the Outlook icon in the notification area of the Windows taskbar, also known as the notification area. 3). in the menu that appears, click Test E-mail AutoConfiguration . 4). Enter your E-mail Address and Password (if not logged into the domain) in the respective edit boxes. 5). Choose the desired auto configuration methods with Use Autodiscover, clear other selection . 6). Click Test. Vinod |CCNA|MCSE 2003 +Messaging|MCTS|ITIL V3|

Thanks for your quick reply.I already increased the logging and the event in my first update is result of that. I did "Test E-mail AutoConfiguration" and got local (SiteA)CAS server entries thereThanks,Thanks, Sitaram www.sitaram-pamarthi.com

Check info: 1. Can the F/B data on site A been seen from the mailbox on site C? 2. Can the F/B data on site C been seen from the mailbox on site B? 3. What’s the version of outlook? 4. Quote: “The server siteCmbx2.mydomain.com was not found in the topology” Does the F/B data of mailboxes on siteCmbx2 inaccessible for all users in site A 5. Does the issue also happen via OWA as same as in outlook? Troubleshooting: 1. Please ping the IP address and FQDN of siteCmbx2 from MAILSITEACAS1 2. Please use “DCDIAG /v” and “NETDIAG /v” to do the general test from siteCmbx2 3. Please run ExBPA against the siteCmbx2 for health check

Any update on the issue?