Instant Messaging

[Amy]

have Instant Messaging Service setup on my Exchange server. It had been working just fine since last December but lately the clients have been complaining. Sometimes the contact list is absolutely wrong as far as offline or online and I know it has to update but the lists are sometimes wrong all day. Some of the messages are sent with no errors but it never shows up on the receiving end. When replying to a message it states that the message could not reach the person that just sent the message and they are both logged on. Lets see, mmmmm, ok the changes I've made since this started have been SP3 for Exchange not Windows, and the only other one is a Helpdesk from Tom Rizzo's Programming Book. Has anyone else had problems like this and how did you resolve it? Could it be that I changed the directory security on the default web site and how are your directory security authentication settings set up? I have my server setup as an IM Virtual Directory. I edited the client installs so that they cannot connect to the internet for IM (MSN, Hotmail), they can only connect to Exchange Server.

We use IM as a flash to let people know they have another phone call, so a quick response would be very helpful.

Any help is GREATLY appreciated,

Thanks,
Amy