Neils personal site

During some high user load testing on a new 64-bit Citrix server build, we noticed Outlook using rather more system resources than it should, which was limited the total number of users we could support.

This Microsoft KB article details a registry tweak you can apply to your 64-bit system to increase the "offline polling" that Outlook performs against your Exchange server, and this in turn reduces the resource usage of Outlook allowing more users per box.

Given your Citrix and Exchange servers are usually located quite close to each other, there could be an argument for disabling this offline check altogether, although that may have other implications if your Exchange server was ever offline.

It's also quite an impression KB article title :)