We moved a customers servers running ESX VMWARE from HP Procurve switches to Catalyst 3750G switches at the weekend. After this their MS Exchange Server has locked up 3 times with processes having to be killed and server rebooted to restart exchange. It's been OK since 16:00 yesterday but there is doubt over the new switches ("It was OK until we started using the Cisco Switches"). I can't find any errors on the switches and do not believe there is a network fault, but has anyone seen specific issues with VMWARE / MS Exchange and Cat 3750's. IPbase switches 12.2.46SE.
I'm convinced there is no issue with the switches but the customers is not.