Hab auch IE7 und bei mir geht's einwandfrei. Ich verstehe jetzt nicht woran es liegt
#include <IE.au3>
[/autoit][autoit][/autoit][autoit]$sUsername = "*****"
$sPassword = "******"
$url = "http://193.27.52.3/Citrix/MetaFrame/default/default.aspx"
$oIE = _IECreate($url, 0,1,1,0)
$oHWND = _IEPropertyGet($oIE, "hwnd")
WinSetState ($oHWND, "", @SW_MAXIMIZE )
ControlSend("DATEV-Software online - Windows Internet Explorer","","",$sUsername)
ControlSend("DATEV-Software online - Windows Internet Explorer","","","{TAB}")
ControlSend("DATEV-Software online - Windows Internet Explorer","","",$sPassword)
ControlSend("DATEV-Software online - Windows Internet Explorer","","","{Enter}")