Sorry for replying to my post, but I've found out an important information:
There is an logfile from the installation in the "Windows\OutlookLive\ClientLog0.txt" on the mobile. Is there anyone who has already installed the outlook-update on his phone with 2.03 firmware? I need the link from this file. I've found this one on another phone, but it has a too old ROM so I can't install it on my phone...
The file
https://outlook.vo.msecnd.net/Outloo...KU1.2_0407.cab is for Build: 19965 Min: 19608 Max: 20269
But my phone has Build 20764
Please help!