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I am testing Windows 2008 R2 as a desktop OS. But Oa in my company must be installed in it.

Unfortunately the "Administering the ActiveX Installer Service in Windows 7" document by Microsoft states:

The ActiveX Installer Service is not included in Windows Server® 2008 R2. If you attempt to install an ActiveX control from your Web browser on a computer running Windows Server 2008 R2, a User Account Control dialog box with a yellow bar will be displayed warning you that the publisher is unknown.

How can I make it work?

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@jazzson: what is "Oa"? – Peter Mortensen Apr 22 '10 at 18:17
@Peter - Maybe he means OWA? Who knows. – MDMarra May 4 '10 at 17:38

I think that's just a warning. It's been a while since I've seen one, but it just asks you if you want to proceed or not.

Answering "yes" will install the ActiveX control.

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I downloaded ActiveX manually, and installed it sucessfully in command mode:

regsvr32 oatree.ocx

System asked me to reinstall it while re-entering application!

So strange!

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So, wait, is this the solution you've found? Or is this an update to the question? – random Apr 25 '10 at 3:03

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