SkypeforBusinessQuickStartGuide-ContactsPresenceandIM.PDF - Quick Reference about instant messaging and presence
SkypeforBusinessQuickStartGuide-SharingandCollaboration.pdf - Quick Reference about sharing and collaboration
SkypeforBusinessQuickStartGuide-Video.pdf - Quick Reference about starting a video call
SkypeforBusinessQuickStartGuide-AudioSetupandMakingCalls.pdf - Quick Reference about audio setup and making calls
SkypeforBusinessQuickStartGuide-Meetings.pdf - Quick Reference about meeting/conferencing