Outlook 2007 chronically slow on Server 2008

Just spend a very frustrating hour and a half installing updates and hitting Google repeatedly trying to fix an apparently simple problem - Outlook 2007 SP1 installed on Windows Server 2008 x64 being slow. And I don't mean "a bit sluggish", I mean, click on the icon and literally make a cup of tea before it opens. Anyway, tried every update released (nothing), Safe Mode (still nothing), streaming it with Xenapp 5 or installing it locally (same problem) and swearing (made me feel better).

Eventually I tried a command I read on a forum post about a similar problem and it worked straight away!

Run CMD as Administrator (right click command prompt, Run As Administrator and typed

"netsh interface tcp set global autotuninglevel=disable"

And rebooted. All sorted, flies along now. Well, I say flies along, it moves at a usable speed - so normal then. Going to do this on all our Xenapp 5 Windows 2008 servers now since they all seem to have the same issue.

Here's a post about what this changes:

http://www.petri.co.il/improve_windows_vista_network_performance.htm