Is IE8 Compatibility View mode considered a "limited" version of IE8?

Hi

I am having a discussion with an external development company and think that I may have mis-specified something on a development project that they are about to do for me. It's not a show-stopper as we can hopefully re-spec the project before any big costs are wasted, but I'd like an expert's opinion on it anyway please.

Within my company we need to run IE8 Compatibility View mode due to some old web applications that don't work properly within IE8 (for various other reasons we must run this browser version - not IE7 or IE9).

The external company said in their tech docs that I needed to run "Internet Explorer 8" to run their software. I assumed that it would work in IE8 Compatibility View mode. Was I wrong?

They say that they specified IE8 in their documentation and that it was my fault for not telling them that I needed to run all of my users in IE8 Compatibility View mode. Their view is that IE8 Compatibility View mode isn't the full version of IE8 or the default version of IE8.

Would you tend to agree with them or with me? (We now have a plan to fix the situation, but I'm keen to know your thoughts so that I don't end up like this in future.)

Thanks for your thoughts.
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jcimarronCommented:
I would not say that IE8 is limited.  In fact I would say it is more flexible for being able to accomodate coding not meant for it.
Here is an explanation of "Compatibility View" and how it works.  
http://msdn.microsoft.com/en-us/library/dd567845(v=vs.85).aspx
It usually runs only when you put a web domain in the "Compatibility View" list.

"I assumed that it would work in IE8 Compatibility View mode. Was I wrong?"
What is the installed browser?  If IE8 you need run in Compatibility View only when the page is coded for a browser other than IE8.

"Within my company we need to run IE8 Compatibility View mode due to some old web applications "
When you are using the old applications, that may be the time to run in Compatibility View , and run normal IE8 the rest of the time.  But I am not sure that Compatibility View has anything to do with old web applications.  Rather it accomodates the coding on a web site.  But if you find it helps use it.  I do not know what you would enter into the Compatibility View list for an application.
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