[horde] EI8 Problems

[Luiz Morte]

Hello list,

I have a server with horde-base-3.3

Using IE8, I can't open the menu to use, for example, vacation. If a
menu has a link, I can't expanding it.

I've tried to put this in httpd.conf, but it doesn't work:
<IfModule headers_module>
   Header set X-UA-Compatible: IE=EmulateIE7
</IfModule>

I can't upgrade my system now.

Is there something to change to fix this in the code?

Thanks in advance,
Luiz.