I installed Office 2013 SP1 today and I noticed that my Outlook client would no longer allow me to drag and drop emails into subfolders in my inbox. Clicking and holding would not give me the “ghost” image of the folder as I dragged it to the subfolder and when I reached the subfolder in my inbox all it would do was highlight it. I restarted my client and computer but it didn’t fix it.
I found this old thread that suggested I just hit the ESC key a bunch of times while Outlook was active. It worked! :-/ I sent the mother ship a frown face already on this.