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diff --git a/OpenSim/Services/HypergridService/HGInstantMessageService.cs b/OpenSim/Services/HypergridService/HGInstantMessageService.cs
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+++ b/OpenSim/Services/HypergridService/HGInstantMessageService.cs
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+/*
+ * Copyright (c) Contributors, http://opensimulator.org/
+ * See CONTRIBUTORS.TXT for a full list of copyright holders.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of the OpenSimulator Project nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+using System;
+using System.Collections.Generic;
+using System.Net;
+using System.Reflection;
+
+using OpenSim.Framework;
+using OpenSim.Services.Connectors.Friends;
+using OpenSim.Services.Connectors.Hypergrid;
+using OpenSim.Services.Interfaces;
+using OpenSim.Services.Connectors.InstantMessage;
+using GridRegion = OpenSim.Services.Interfaces.GridRegion;
+using OpenSim.Server.Base;
+using FriendInfo = OpenSim.Services.Interfaces.FriendInfo;
+
+using OpenMetaverse;
+using log4net;
+using Nini.Config;
+
+namespace OpenSim.Services.HypergridService
+{
+    /// <summary>
+    /// Inter-grid IM
+    /// </summary>
+    public class HGInstantMessageService : IInstantMessage
+    {
+        private static readonly ILog m_log =
+                LogManager.GetLogger(
+                MethodBase.GetCurrentMethod().DeclaringType);
+
+        private const double CACHE_EXPIRATION_SECONDS = 120000.0; // 33 hours
+
+        static bool m_Initialized = false;
+
+        protected static IGridService m_GridService;
+        protected static IPresenceService m_PresenceService;
+        protected static IUserAgentService m_UserAgentService;
+
+        protected static IInstantMessageSimConnector m_IMSimConnector;
+
+        protected static Dictionary<UUID, object> m_UserLocationMap = new Dictionary<UUID, object>();
+        private static ExpiringCache<UUID, GridRegion> m_RegionCache;
+
+        private static string m_RestURL;
+        private static bool m_ForwardOfflineGroupMessages;
+        private static bool m_InGatekeeper;
+
+        public HGInstantMessageService(IConfigSource config)
+            : this(config, null)
+        {
+        }
+
+        public HGInstantMessageService(IConfigSource config, IInstantMessageSimConnector imConnector)
+        {
+            if (imConnector != null)
+                m_IMSimConnector = imConnector;
+
+            if (!m_Initialized)
+            {
+                m_Initialized = true;
+
+                IConfig serverConfig = config.Configs["HGInstantMessageService"];
+                if (serverConfig == null)
+                    throw new Exception(String.Format("No section HGInstantMessageService in config file"));
+
+                string gridService = serverConfig.GetString("GridService", String.Empty);
+                string presenceService = serverConfig.GetString("PresenceService", String.Empty);
+                string userAgentService = serverConfig.GetString("UserAgentService", String.Empty);
+                m_InGatekeeper = serverConfig.GetBoolean("InGatekeeper", false);
+                m_log.DebugFormat("[HG IM SERVICE]: Starting... InRobust? {0}", m_InGatekeeper);
+
+
+                if (gridService == string.Empty || presenceService == string.Empty)
+                    throw new Exception(String.Format("Incomplete specifications, InstantMessage Service cannot function."));
+
+                Object[] args = new Object[] { config };
+                m_GridService = ServerUtils.LoadPlugin<IGridService>(gridService, args);
+                m_PresenceService = ServerUtils.LoadPlugin<IPresenceService>(presenceService, args);
+                m_UserAgentService = ServerUtils.LoadPlugin<IUserAgentService>(userAgentService, args);
+
+                m_RegionCache = new ExpiringCache<UUID, GridRegion>();
+
+                IConfig cnf = config.Configs["Messaging"];
+                if (cnf == null)
+                {
+                    return;
+                }
+
+                m_RestURL = cnf.GetString("OfflineMessageURL", string.Empty);
+                m_ForwardOfflineGroupMessages = cnf.GetBoolean("ForwardOfflineGroupMessages", false);
+
+            }
+        }
+
+        public bool IncomingInstantMessage(GridInstantMessage im)
+        {
+            m_log.DebugFormat("[HG IM SERVICE]: Received message from {0} to {1}", im.fromAgentID, im.toAgentID);
+            UUID toAgentID = new UUID(im.toAgentID);
+
+            bool success = false;
+            if (m_IMSimConnector != null)
+            {
+                //m_log.DebugFormat("[XXX] SendIMToRegion local im connector");
+                success = m_IMSimConnector.SendInstantMessage(im);
+            }
+            else
+            {
+                success = TrySendInstantMessage(im, "", true, false);
+            }
+
+            if (!success && m_InGatekeeper) // we do this only in the Gatekeeper IM service
+                UndeliveredMessage(im);
+
+            return success;
+        }
+
+        public bool OutgoingInstantMessage(GridInstantMessage im, string url, bool foreigner)
+        {
+            m_log.DebugFormat("[HG IM SERVICE]: Sending message from {0} to {1}@{2}", im.fromAgentID, im.toAgentID, url);
+            if (url != string.Empty)
+                return TrySendInstantMessage(im, url, true, foreigner);
+            else
+            {
+                PresenceInfo upd = new PresenceInfo();
+                upd.RegionID = UUID.Zero;
+                return TrySendInstantMessage(im, upd, true, foreigner);
+            }
+
+        }
+
+        protected bool TrySendInstantMessage(GridInstantMessage im, object previousLocation, bool firstTime, bool foreigner)
+        {
+            UUID toAgentID = new UUID(im.toAgentID);
+
+            PresenceInfo upd = null;
+            string url = string.Empty;
+
+            bool lookupAgent = false;
+
+            lock (m_UserLocationMap)
+            {
+                if (m_UserLocationMap.ContainsKey(toAgentID))
+                {
+                    object o = m_UserLocationMap[toAgentID];
+                    if (o is PresenceInfo)
+                        upd = (PresenceInfo)o;
+                    else if (o is string)
+                        url = (string)o;
+
+                    // We need to compare the current location with the previous 
+                    // or the recursive loop will never end because it will never try to lookup the agent again
+                    if (!firstTime)
+                    {
+                        lookupAgent = true;
+                        upd = null;
+                    }
+                }
+                else
+                {
+                    lookupAgent = true;
+                }
+            }
+
+            //m_log.DebugFormat("[XXX] Neeed lookup ? {0}", (lookupAgent ? "yes" : "no"));
+
+            // Are we needing to look-up an agent?
+            if (lookupAgent)
+            {
+                // Non-cached user agent lookup.
+                PresenceInfo[] presences = m_PresenceService.GetAgents(new string[] { toAgentID.ToString() });
+                if (presences != null && presences.Length > 0)
+                {
+                    foreach (PresenceInfo p in presences)
+                    {
+                        if (p.RegionID != UUID.Zero)
+                        {
+                            //m_log.DebugFormat("[XXX]: Found presence in {0}", p.RegionID);
+                            upd = p;
+                            break;
+                        }
+                    }
+                }
+
+                if (upd == null && !foreigner)
+                {
+                    // Let's check with the UAS if the user is elsewhere
+                    m_log.DebugFormat("[HG IM SERVICE]: User is not present. Checking location with User Agent service");
+                    url = m_UserAgentService.LocateUser(toAgentID);
+                }
+
+                // check if we've tried this before..
+                // This is one way to end the recursive loop
+                //
+                if (!firstTime && ((previousLocation is PresenceInfo && upd != null && upd.RegionID == ((PresenceInfo)previousLocation).RegionID) ||
+                                    (previousLocation is string && upd == null && previousLocation.Equals(url))))
+                {
+                    // m_log.Error("[GRID INSTANT MESSAGE]: Unable to deliver an instant message");
+                    m_log.DebugFormat("[HG IM SERVICE]: Fail 2 {0} {1}", previousLocation, url);
+
+                    return false;
+                }
+            }
+
+            if (upd != null)
+            {
+                // ok, the user is around somewhere. Let's send back the reply with "success"
+                // even though the IM may still fail. Just don't keep the caller waiting for
+                // the entire time we're trying to deliver the IM
+                return SendIMToRegion(upd, im, toAgentID, foreigner);
+            }
+            else if (url != string.Empty)
+            {
+                // ok, the user is around somewhere. Let's send back the reply with "success"
+                // even though the IM may still fail. Just don't keep the caller waiting for
+                // the entire time we're trying to deliver the IM
+                return ForwardIMToGrid(url, im, toAgentID, foreigner);
+            }
+            else if (firstTime && previousLocation is string && (string)previousLocation != string.Empty)
+            {
+                return ForwardIMToGrid((string)previousLocation, im, toAgentID, foreigner);
+            }
+            else
+                m_log.DebugFormat("[HG IM SERVICE]: Unable to locate user {0}", toAgentID);
+            return false;
+        }
+
+        bool SendIMToRegion(PresenceInfo upd, GridInstantMessage im, UUID toAgentID, bool foreigner)
+        {
+            bool imresult = false;
+            GridRegion reginfo = null;
+            if (!m_RegionCache.TryGetValue(upd.RegionID, out reginfo))
+            {
+                reginfo = m_GridService.GetRegionByUUID(UUID.Zero /*!!!*/, upd.RegionID);
+                if (reginfo != null)
+                    m_RegionCache.AddOrUpdate(upd.RegionID, reginfo, CACHE_EXPIRATION_SECONDS);
+            }
+
+            if (reginfo != null)
+            {
+                imresult = InstantMessageServiceConnector.SendInstantMessage(reginfo.ServerURI, im);
+            }
+            else
+            {
+                m_log.DebugFormat("[HG IM SERVICE]: Failed to deliver message to {0}", reginfo.ServerURI);
+                return false;
+            }
+
+            if (imresult)
+            {
+                // IM delivery successful, so store the Agent's location in our local cache.
+                lock (m_UserLocationMap)
+                {
+                    if (m_UserLocationMap.ContainsKey(toAgentID))
+                    {
+                        m_UserLocationMap[toAgentID] = upd;
+                    }
+                    else
+                    {
+                        m_UserLocationMap.Add(toAgentID, upd);
+                    }
+                }
+                return true;
+            }
+            else
+            {
+                // try again, but lookup user this time.
+                // Warning, this must call the Async version
+                // of this method or we'll be making thousands of threads
+                // The version within the spawned thread is SendGridInstantMessageViaXMLRPCAsync
+                // The version that spawns the thread is SendGridInstantMessageViaXMLRPC
+
+                // This is recursive!!!!!
+                return TrySendInstantMessage(im, upd, false, foreigner);
+            }
+        }
+
+        bool ForwardIMToGrid(string url, GridInstantMessage im, UUID toAgentID, bool foreigner)
+        {
+            if (InstantMessageServiceConnector.SendInstantMessage(url, im))
+            {
+                // IM delivery successful, so store the Agent's location in our local cache.
+                lock (m_UserLocationMap)
+                {
+                    if (m_UserLocationMap.ContainsKey(toAgentID))
+                    {
+                        m_UserLocationMap[toAgentID] = url;
+                    }
+                    else
+                    {
+                        m_UserLocationMap.Add(toAgentID, url);
+                    }
+                }
+
+                return true;
+            }
+            else
+            {
+                // try again, but lookup user this time.
+
+                // This is recursive!!!!!
+                return TrySendInstantMessage(im, url, false, foreigner);
+            }
+
+        }
+
+        private bool UndeliveredMessage(GridInstantMessage im)
+        {
+            if (m_RestURL != string.Empty && (im.offline != 0)
+                && (!im.fromGroup || (im.fromGroup && m_ForwardOfflineGroupMessages)))
+            {
+                m_log.DebugFormat("[HG IM SERVICE]: Message saved");
+                return SynchronousRestObjectPoster.BeginPostObject<GridInstantMessage, bool>(
+                         "POST", m_RestURL + "/SaveMessage/", im);
+
+            }
+
+            else
+            {
+                return false;
+            }
+        }
+    }
+}