IE 11

Can IE 11 be managed by Group Policies on Windows Server 2008?

Yes

If so, how?

You need the Administrative templates for Internet Explorer 11:
http://technet.microsoft.com/en-us/library/dn321438.aspx
http://www.microsoft.com/en-us/download/details.aspx?id=40905

It didn't work so it is not the solution.

The templates at:
http://www.microsoft.com/en-us/download/details.aspx?id=40905 
are for Windows Server 2003.

However, this:
http://technet.microsoft.com/en-us/library/dn321438.aspx
says, "you can copy the updated Inetres.admx and Inetres.adml files from another computer to the PolicyDefinitions folder on this computer."

So I copied those files from a 2008 R2 box with IE 11 installed on it to the 2008 server in the %SystemRoot%\PolicyDefinitions folder. I then fired up Group Policy Management, edited the GPO, and navigated to User Configuration, Policies, Administrative Templates, Windows Components, Internet Explorer. The settings in there are different, so that appears to have worked. (Unfortunately, it will be hard to see if Compatibility mode is turned on for a site because Microsoft turned off the button...see: http://technet.microsoft.com/en-us/library/dn321449.aspx)

However, it did not affect the ability to set proxy settings. They are no longer set in Internet Explorer Maintenance. See:
http://technet.microsoft.com/en-us/library/dn338129.aspx

Since they are not in that section of Group Policy, the proxy settings do not appear to be controlled by Administrative Templates. This:
http://johnfail.wordpress.com/2013/06/15/configuring-internet-explorer-10s-proxy-via-group-policy/
describes (with screenshots) how to configure proxy settings for IE 10 on a 2012 server. I'm assuming that proxy settings for IE 11 are similar.

On my 2008 server in the GPO, when I navigate to User Configuration, Preferences, Control Panel Settings, right-click on Interent Settings and select New, all I see is Internet Explorer 5, 6, and 7.

How do I get Internet Explorer 8, 9, 10, and 11 (especially 11) to show up?

@BlueCompute: I'll try that and post back my results

the link posted earlier for the administrative templates does show only 2003 for system requirements - however, if you look at the installation instructions, it shows 2008 in the list and has a link that explains how to do it

http://technet.microsoft.com/en-us/library/cc709647.aspx

It didn't work.

Specifically, I installed a Win7 box in the lab, installed RSAT, installed all updates, installed IE 9, 10, and 11. In Group Policy Management when I navigate to User Configuration, Preferences, Control Panel Settings, right-click on Interent Settings and select New, all I see is Internet Explorer 5, 6, 7, and 8.

I'm now going to try Windows 8.

I used Windows 8 in both the lab and in production with mixed results. At least with Windows 8, I can now see IE 10 as it looks in here:
http://johnfail.wordpress.com/2013/06/15/configuring-internet-explorer-10s-proxy-via-group-policy/

And based on this:
http://www.grouppolicy.biz/2013/11/internet-explorer-11-group-policy-preferences/
I should be able to set proxy settings on the IE 10 object and those settings get set on IE 11.

However, not all of the proxy settings come down to an IE 11 client. Specifically, the proxy server comes down, but none of the exceptions are there, and “Bypass proxy server for local addresses” is not checked. Does anyone know why that those would not be set?

Also, when I add sites to User Config, Policies, Admin Templates, Windows Components, Internet Explorer, Compatibility View, Use Policy List of Internet Explorer 7 sites, why do they NOT show up in IE 11 when you open the Compatibility View Settings dialog box?

My solution is actually someone else's from another forum post. I gave credit in my post.