Like wandered (and lots of others reviewing on the Windows Phone Store) the Solitaire Collection is a battery and CPU hog on a phone (mine's an 8X but other reports are on 920s) -- makes the phone...
8 to 8.1 keeps everything, including apps.
8.1 Preview to 8.1 keeps data but you have to reinstall your applications.
I agree with noirsoft:
Paul Thurrott's Field Guide to X for a large book
Paul Thurrott's Pocket Guide to X for a small book
Makes sense: that looks like Exchange 2013 OWA.
Good article: no need for NT, just follow these guidelines (and if you're an Admin rolling out 8, use GPO to achieve some of the same).
People are making interesting suggestions but most of the solutions (including this article) are sledgehammer to crack a nut!
The one sensible idea in the comments here is the idea of a...
Chimera13 -- and you can Federate Lync with other organizations with Lync, for example (not knowing your business) any of your customers who have Lync.
Microsoft isn't getting out of IM; they do it brilliantly in Lync. Which is now handled by the Skype division... Paul has called it -- the issue is in the Skype division's management by Microsoft...
I just got an 8X on Vodafone in the UK and the update was applied automatically as soon as I connected to a wireless network.