[Cakez0r]

But I expect most servers don't have any software on them related to opening emails or Office files. I would've thought that Rackspace reserves mandatory server hotfixes for only the most serious vulnerabilities (E.G. shellshock).

[Anderkent]

While ppt's are the vector in the wild it seems the core vulnerability is in packager.dll, so possibly other ways of abusing it exist.

[viraptor]

Why not? Automated document processing, hosted desktop, and a few other ideas come to mind where the server would be affected.