After installing KB2412171 on client computers I found another bug in this update.
Normally Outlook configure your Outlook profile on your primarily smtp address. But after this update this is changed to the user principal name. If you have not added user principal name to a mail user you will see dat autodiscovery wil fail.
Solution Uninstalling KB2412171
%windir%\System32\msiexec.exe /package <Office 2007 product code> /uninstall <patch code for the MSP from KB2412171> /Q /L*V %temp%\Remove_KB2412171.log Product codes (or “GUIDs”) for Office 2007 and Outlook 2007 are as follows: Standard: {90120000-0012-0000-0000-0000000FF1CE} Professional: {90120000-0014-0000-0000-0000000FF1CE} Professional Plus:{90120000-0011-0000-0000-0000000FF1CE} Enterprise:{90120000-0030-0000-0000-0000000FF1CE} Outlook 2007 Standalone: {90120000-001A-0000-0000-0000000FF1CE} Patch codes for the MSP files related to KB2412171 are as follows: {7961E819-93A5-40A8-8469-4BE2FBBFACEF} (for the original patch) {752A0B7C-BD24-4362-AC86-AB63FEE6F46F} (for the re-release patch)
For my did this the trick
%windir%\System32\msiexec.exe /package {90120000-0030-0000-0000-0000000FF1CE} /uninstall {752A0B7C-BD24-4362-AC86-AB63FEE6F46F} /Q /L*V c:\Remove_KB2412171.log