On XP, IE8 browser reported as IE6 after update to build 8800/8810

On XP, IE8 browser reported as IE6 after update to build 8800/8810

Greetings all,
 
Currently we have the issue that after we upgraded to build 8800/8810, our IE8 browsers on our XP workstations are reported as IE6. Result: We can't login.
 
Luckily the interface still works on the dedicated server and with Windows 7. But with a large supportteam, using the server is not really a longterm sollution...
 
Version of IE8 on XP with SP3         : 8.0.6001.18702C0 / 128-bit
Version on server (Windows 2003R2): 8.0.6001.18702    / 128-bit

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