Several issues going on here.
Our backbone consists of 2 3com Switch 4400's 48 port's each connected via a backplane kit. 10/100
We have 7 MIcrosoft 2003 Server's all with latest service patches etc...
Exchange 2003 Server SP2 on its own box with 65 users
We have a Dedicated full T1 of internet with a Watchguard Firebox III 700 device
Recently we have been experiencing a lot of slowness of network traffic. From not being able to get out on the internet, to outlook telling is it is trying to connect to the Exchange server connecting and then going thru that process several times througout the day.
I have looked thru the logs on the Firewall and I see a lot of HTTP traffic going out but that's about it. Nothing out of the ordinary at least. The traffic on the physical switches seems to be relatively standard as well however they are about 7 years old.