Does Mountain Lion (10.8.4) come with SharePoint plug-ins, or did I just install these?

I did a custom installation of Microsoft Office 2011 for Mac on my MacBook Air running 10.8.4., but I changed my mind and decided to uninstall it. I only installed Word, Excel, and Proofing Tools (English only). I'm reading up on how to fully remove all the tidbits Microsoft sprinkled about, and I noticed a couple files on my system: /Library/Internet Plug-Ins/SharePointBrowserPlugin.plugin /Library/Internet Plug-Ins/SharePointWebKitPlugin.webplugin I didn't include SharePoint in the installation, so I'm not sure that's where these files came from. It's a new machine, so the only alternative is that they were included with OS X 10.8.4, in which case I'm inclined to leave them be. Does anybody know more about these files, where they likely came from?