After trying to log into the admin panel, I found something that seems relevant in /opt/zimbra/log/mailbox.log
Code:
2010-03-11 15:53:43,443 INFO [btpool0-226] [name=tom@liveglobalbid.com;mid=26;ip=192.168.253.84;ua=ZimbraWebClient - [unknown] (Linux);] SoapEngine - handler exception
com.zimbra.common.service.ServiceException: invalid request: LDAP schema violation: [LDAP: error code 65 - unrecognized objectClass 'posixAccount']
ExceptionId:btpool0-226:1268344423442:081ce69aff93bdfb
Code:service.INVALID_REQUEST
at com.zimbra.common.service.ServiceException.INVALID_REQUEST(ServiceException.java:258)
at com.zimbra.cs.account.ldap.LdapProvisioning.modifyAttrsInternal(LdapProvisioning.java:304)
at com.zimbra.cs.account.ldap.LdapProvisioning.modifyAttrs(LdapProvisioning.java:270)
at com.zimbra.cs.account.ldap.LdapProvisioning.modifyAttrs(LdapProvisioning.java:251)
at com.zimbra.cs.account.Provisioning.modifyAttrs(Provisioning.java:1662)
at com.zimbra.cs.service.admin.ModifyAdminSavedSearches.handle(ModifyAdminSavedSearches.java:98)
at com.zimbra.cs.service.admin.ModifyAdminSavedSearches.handle(ModifyAdminSavedSearches.java:58)
at com.zimbra.soap.SoapEngine.dispatchRequest(SoapEngine.java:428)
at com.zimbra.soap.SoapEngine.dispatch(SoapEngine.java:284)
at com.zimbra.soap.SoapEngine.dispatch(SoapEngine.java:158)
at com.zimbra.soap.SoapServlet.doPost(SoapServlet.java:273)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
at com.zimbra.cs.servlet.ZimbraServlet.service(ZimbraServlet.java:185)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1117)
at org.mortbay.servlet.UserAgentFilter.doFilter(UserAgentFilter.java:81)
at org.mortbay.servlet.GzipFilter.doFilter(GzipFilter.java:132)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1108)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:370)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:406)
at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)
at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.handler.rewrite.RewriteHandler.handle(RewriteHandler.java:350)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:543)
at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:939)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:755)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:405)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
at org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:451)
Caused by: javax.naming.directory.SchemaViolationException: [LDAP: error code 65 - unrecognized objectClass 'posixAccount']; remaining name 'uid=tom,ou=people,dc=liveglobalbid,dc=com'
at com.sun.jndi.ldap.LdapCtx.mapErrorCode(LdapCtx.java:3048)
at com.sun.jndi.ldap.LdapCtx.processReturnCode(LdapCtx.java:2963)
at com.sun.jndi.ldap.LdapCtx.processReturnCode(LdapCtx.java:2769)
at com.sun.jndi.ldap.LdapCtx.c_modifyAttributes(LdapCtx.java:1451)
at com.sun.jndi.toolkit.ctx.ComponentDirContext.p_modifyAttributes(ComponentDirContext.java:255)
at com.sun.jndi.toolkit.ctx.PartialCompositeDirContext.modifyAttributes(PartialCompositeDirContext.java:172)
at javax.naming.directory.InitialDirContext.modifyAttributes(InitialDirContext.java:153)
at com.zimbra.cs.account.ldap.ZimbraLdapContext.modifyAttributes(ZimbraLdapContext.java:568)
at com.zimbra.cs.account.ldap.LdapUtil.modifyAttrs(LdapUtil.java:414)
at com.zimbra.cs.account.ldap.LdapProvisioning.modifyAttrsInternal(LdapProvisioning.java:292)
... 35 more
2010-03-11 15:53:54,383 INFO [btpool0-231] [name=fergus@liveglobalbid.com;mid=4;ip=192.168.253.2;ua=Yahoo! Zimbra Desktop/1.0.2_1652_Linux;] soap - SyncRequest