Updated 2007-07-02: Now it seems to work for real!
Note: This only works for Nokia devices with Symbian OS 9.1 (S60 3rd Edition).

Instructions:
1. Download WindowsLive_S60_3_0_v_1_0_6141_Signed.rar
2. Unrar the file
  2.a Google if you don't now how to unrar (or what the hell, download Winrar from www.rarlabs.com.
3. Transfer both files to the device.
  3.a If you don't know how. Google is your friend or maybe you shouldn't be doing this...
4. Install in this order: 1. dep.sisx, 2. WindowsLive_S60_3_0_v_1_0_6141_Signed.sis.
5. Enjoy.

You're welcome.
info@endera.se - no stupid questions at all.