Exchange 2010 SP1 upgrade prerequisite checks fail for KB979744, but update fails as Not Applicable

Posted by Michael Shimmins on Server Fault See other posts from Server Fault or by Michael Shimmins
Published on 2011-01-09T00:24:27Z Indexed on 2011/01/09 0:55 UTC
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I'm trying to install the SP1 update to an RTM Exchange 2010 box. The Client Access Role Prerequisites are failing, complaining that KB979744 isn't installed.

I downloaded the update and tried to install it, however it will not install complaining that 'The update does not apply to your system'.

A discussion on TechNet indicates that I need .NET 2.0 or 3.5 installed (both are). Aside from that I've been unable to find anything helpful.

Hopefully someone has encountered this and knows how to get around it, don't really want to use up a support call on this.

Edit:

This is on a 64-bit edition of Windows Server 2008 Datacenter (without Hyper-V) SP2.

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