Targets for conditional comments in html?

I know you can target browsers with conditional comments, as explained here in MSDN.

But I just saw one that looked like this <!--[if gte mso 9]>

What does this check for and what (other than browsers) can you check for with conditional comments?

EDIT

Is there any documentation on the conditional comm开发者_如何学Cents. What options and what version numbers you can use?

mso = Microsoft Outlook

9 = 2007

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It is used for targeting Microsoft Outlook 2007 and later in HTML emails. See this article for details.

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This German version of Wikipedia lists the various targets (IE, Microsoft Office, and VML).

http://de.wikipedia.org/wiki/Conditional_Comments (You will need to Google translate)

Also, this post suggests that MS Publisher can also be targeted

http://www.adras.com/can-t-view-page-in-browser.t32980-10-2.html

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     1.   <!--[if IE 8]>
        <p>Welcome to Internet Explorer 8.</p>
        <![endif]-->


      2.  <![if lt IE 8]>
        <p>Please upgrade to Internet Explorer version 8.</p>
        <![endif]>
// include this too
This is <comment>not</comment> Internet Explorer

1. firefox - print - nothing

   IE 8 - print - Welcome to Internet Explorer 8.

2. Firefox - print - Please upgrade to Internet Explorer version 8.

   IE 8 - pirnt - nothing but Welcome to Internet Explorer 8. if inclcded.

<!-- comment inner HTML Also while

<! will not comment inner HTML. as in FIREFOX example.