Instant Messanger - C# with MS Access

I've always wanted to create a chat client since I could remember. Where I work i thought I would be a good idea to roll something like this out, but i had challenges. I tried looking for solutions around the net and all I could find was solutions that made use of sockets. In many circumstances this would be perfect. However where I work all of our computers are blocked from seeing each other and the network is pretty secure. The only way we can share information is through a file cluster/server. The only way I was able to do this was using MS Access as the communication tool between computers and so far it has worked well. User interface is done with C# and MS Access handles the transactions.  It's a really simple database. I will pass more informaiton on later posts as how i got this done. Very minimal maintenance is required. If anyone is interested let  me know