If you use SKYDRIVE to store your documents, please be aware of the following issues:
1) ID 1976: If you try to use the powerstory feature to attach your powerpoint file to a TFS workitem, it will fail when using PowerPoint 2013. This is because PowerPoint 2013 deals with skydrive differently. Because it stores the powerpoint file directly into skydrive first and then syncs with your local drive a temporary file we create during the attachment process can't be found by powerpoint 2013.
2) ID 2007: PowerStory does not save the WORK ITEM ID in the PPT file after generating test when the powerpoint file is stored in a skydrive folder. As such the user must find workitem using the powerstory feature to search for workitems in TFS each time a test case is generated.
3) ID 1972: SKYDRIVE: test case names & titles include %20 instead of a space. (powerpoint 2013 only and when the file is on skydrive)