I'm deploying exchange 2k7on a brand new serverand everytime I login, I get an error saying that Microsoft Exchange Schema Event Sink for Windows NT encountered a problem and needed to close. I've looked at the logs for the server and it I noticed it was error number 4001. It also told me to look for logs just before or after this log which gave me a problem. So then I looked and there was a warning that was two logs before this one and it was number error 1021. Does anyone here know what this is about? I've pasted the log text below: Error 1021: Process MSExchangeFDS.exe (PID=2884). Could not find directory \\MASTER\ExchangeOAB\4151f7c1-ace9-4e42-b3ed-c8ad4fb4060b. This is normal if it has never been generated. Otherwise, make sure this directory and share has read permission for "Exchange Servers" group. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. Error 4001: A transient failure has occurred. The problem may resolve itself in a while. The service will retry in 56 seconds. Diagnostic information: Cannot open mailbox /o=ATD/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Configuration/cn=Servers/cn=MASTER/cn=Microsoft System Attendant.Microsoft.Exchange.Data.Storage.ConnectionFailedTransientException: Cannot open mailbox /o=ATD/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Configuration/cn=Servers/cn=MASTER/cn=Microsoft System Attendant. ---> Microsoft.Mapi.MapiExceptionNetworkError: MapiExceptionNetworkError: Unable to make connection to the server. (hr=0x80040115, ec=-2147221227)Diagnostic context: ...... Lid: 10648 dwParam: 0x6D9 Msg: EEInfo: Generating component: 2 Lid: 14744 dwParam: 0x6D9 Msg: EEInfo: Status: 1753 Lid: 9624 dwParam: 0x6D9 Msg: EEInfo: Detection location: 501 Lid: 13720 dwParam: 0x6D9 Msg: EEInfo: Flags: 0 Lid: 11672 dwParam: 0x6D9 Msg: EEInfo: NumberOfParameters: 4 Lid: 8856 dwParam: 0x6D9 Msg: EEInfo: prm[0]: Unicode string: ncacn_ip_tcp Lid: 8856 dwParam: 0x6D9 Msg: EEInfo: prm[1]: Unicode string: master.atd.autotriminc.com Lid: 12952 dwParam: 0x6D9 Msg: EEInfo: prm[2]: Long val: -1527653632 Lid: 15000 dwParam: 0x6D9 Msg: EEInfo: prm[3]: Pointer val: 0x0x029e0890 (UnknownPtag) Lid: 19778 Lid: 27970 StoreEc: 0x80040115 Lid: 17730 Lid: 25922 StoreEc: 0x80040115 at Microsoft.Mapi.MapiExceptionHelper.ThrowIfError(String message, Int32 hresult, Int32 ec, DiagnosticContext diagCtx) at Microsoft.Mapi.ExRpcConnection.Create(ConnectionCache connectionCache, ExRpcConnectionCreateFlag createFlags, ConnectFlag connectFlags, String serverDn, String userDn, String user, String domain, String password, String httpProxyServerName, Int32 ulConMod, Int32 lcidString, Int32 lcidSort, Int32 cpid, Int32 cReconnectIntervalInMins, Int32 cbRpcBufferSize, Int32 cbAuxBufferSize) at Microsoft.Mapi.ConnectionCache.OpenMapiStore(String mailboxDn, Guid mailboxGuid, Guid mdbGuid, ClientIdentityInfo clientIdentity, String userDnAs, OpenStoreFlag openStoreFlags, CultureInfo cultureInfo, String applicationId) at Microsoft.Mapi.ConnectionCache.OpenMailbox(String mailboxDn, Guid mailboxGuid, Guid mdbGuid, WindowsIdentity windowsIdentityAs, String userDnAs, OpenStoreFlag openStoreFlags, CultureInfo cultureInfo, String applicationId) at Microsoft.Exchange.Data.Storage.ConnectionCachePool.OpenMailbox(String serverDn, String userDn, String mailboxDn, Guid mailboxGuid, Guid mdbGuid, Object identity, ConnectFlag connectFlag, OpenStoreFlag openStoreFlag, CultureInfo cultureInfo, String clientInfoString, Boolean secondTry) --- End of inner exception stack trace --- at Microsoft.Exchange.Data.Storage.ConnectionCachePool.OpenMailbox(String serverDn, String userDn, String mailboxDn, Guid mailboxGuid, Guid mdbGuid, Object identity, ConnectFlag connectFlag, OpenStoreFlag openStoreFlag, CultureInfo cultureInfo, String clientInfoString, Boolean secondTry) at Microsoft.Exchange.Data.Storage.ConnectionCachePool.OpenMailbox(String serverDn, String userDn, String mailboxDn, Guid mailboxGuid, Guid mdbGuid, Object identity, ConnectFlag connectFlag, OpenStoreFlag openStoreFlag, CultureInfo cultureInfo, String clientInfoString, Boolean secondTry) at Microsoft.Exchange.Data.Storage.ConnectionCachePool.OpenMailbox(String serverDn, String userDn, String mailboxDn, Guid mailboxGuid, Guid mdbGuid, Object identity, ConnectFlag connectFlag, OpenStoreFlag openStoreFlag, CultureInfo cultureInfo, String clientInfoString) at Microsoft.Exchange.Data.Storage.MailboxSession.Initialize(LogonType logonType, ExchangePrincipal owner, ADOrgPerson delegateUser, Object identity, OpenMailboxSessionFlags flags) at Microsoft.Exchange.Data.Storage.MailboxSession.CreateMailboxSession(LogonType logonType, ExchangePrincipal owner, ADOrgPerson delegateUser, Object identity, OpenMailboxSessionFlags flags, CultureInfo cultureInfo, String clientInfoString) at Microsoft.Exchange.Data.Storage.MailboxSession.OpenAsAdmin(ExchangePrincipal mailboxOwner, CultureInfo cultureInfo, String clientInfoString) at Microsoft.Exchange.Servicelets.SystemAttendantMailbox.Servicelet.Work() For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

By any chance did the installation fail at any point previously? If not, I think you will possiblyfind an answer from this post: http://forums.microsoft.com/TechNet/ShowPost.aspx?PostID=2253159&SiteID=17