We have 2 Hub Transports & 2 Mailbox servers in a CCR configuration. SP1 is NOT applied. Everything has been running fine for ~6 months, but today mail delivery is *very* slow. I'm watching the queues on both the Hub's and right now one has 166 messages to deliver, the other 114. When I refresh, they go up/down but never to the point where there's 0 in the queue. Any idea what could be causing this? I've looked in the queues and all of the messages are fine, the majority of them are in a 'Ready' status, while others are in 'Active'. None are in Retry or Failed, no errors. There hasn't been any increase in mail activity that would cause this. The performance on all systems seems to be fine, none are taking up more than 10% cpu, and there are no memory problems. The only unusual thing I've been able to spot is that one of our Storage Groups (We have 10) has significantly more transaction logs on it (2.2GB) when compared to the other stores (~0.6GB). We had a full backup run that purged these logs this morning, so that Storage Group may be having a problem. Is there any logging I can enabled that could help troubleshoot this? Any help is greatly appreciated! Matt

Ok, now the queue's just went to 0 on both servers and seem to be processing mail quickly again. This has happened twice already today, lasting about an hour each time.

Once a message is 'queued' and in a 'ready' state,does it have any dependancy on the Global Catalog server in order for delivery to take place? Reason I ask is, I am seeing some higher than normal LDAP Search Times on one of our Global Catalogs.