Okay, trying to convince my orginization to migrate from MS Exchange to Zimbra, we are about 3000 strong. I cannot get the external GAL to sync with active directory. Any Ideas?

GAL Sync Test Failed:

Code:
soap:Receiver
system failure: LDAPSDKUsageException(message='A null object was provided where a non-null object is required (non-null index 0).  Thread stack trace:  getStackTrace(Thread.java:1567) / ensureNotNull(Validator.java:60) / encodeValue(Filter.java:3829) / encodeValue(UBIDLdapFilterFactory.java:258) / expandKey(GalUtil.java:109) / expandFilter(GalUtil.java:43) / expandFilter(GalUtil.java:28) / searchLdapGal(LdapGalSearch.java:76) / checkGalConfig(LdapProvisioning.java:4756) / handle(CheckGalConfig.java:60) / dispatchRequest(SoapEngine.java:422) / dispatch(SoapEngine.java:285) / dispatch(SoapEngine.java:158) / doWork(SoapServlet.java:290) / doPost(SoapServlet.java:206) / service(HttpServlet.java:727) / service(ZimbraServlet.java:208) / service(HttpServlet.java:820) / handle(ServletHolder.java:565) / doFilter(ServletHandler.java:1361) / doFilter(SetHeaderFilter.java:57) / doFilter(ServletHandler.java:1332) / doFilter(UserAgentFilter.java:77) / doFilter(GzipFilter.java:181) / doFilter(ServletHandler.java:1332) / doFilterChain(DoSFilter.java:464) / doFilter(DoSFilter.java:327) / doFilter(ServletHandler.java:1332) / doHandle(ServletHandler.java:477) / handle(ScopedHandler.java:119) / handle(SecurityHandler.java:524) / doHandle(SessionHandler.java:227) / doHandle(ContextHandler.java:1031) / doScope(ServletHandler.java:406) / doScope(SessionHandler.java:186) / doScope(ContextHandler.java:965) / handle(ScopedHandler.java:117) / handle(ContextHandlerCollection.java:250) / handle(HandlerCollection.java:149) / handle(HandlerWrapper.java:111) / handle(RewriteHandler.java:312) / handle(DebugHandler.java:77) / handle(HandlerWrapper.java:111) / handle(Server.java:349) / handleRequest(AbstractHttpConnection.java:452) / content(AbstractHttpConnection.java:894) / content(AbstractHttpConnection.java:948) / parseNext(HttpParser.java:857) / parseAvailable(HttpParser.java:230) / handle(AsyncHttpConnection.java:77) / handle(SslConnection.java:191) / handle(SelectChannelEndPoint.java:609) / run(SelectChannelEndPoint.java:45) / runJob(QueuedThreadPool.java:599) / run(QueuedThreadPool.java:534) / run(Thread.java:722)')
qtp720239731-1121:https://198.61.199.4:7071/service/admin/soap/CheckGalConfigRequest:1347678902347:d24fcab7a53748df