The videos from the Microsoft Exchange Conference (MEC) 2014 are online on Channel 9:
http://channel9.msdn.com/events/mec/2014
The videos can also be downloaded. I've already come across a lot of interesting videos, so it's definitely worth taking a look if you weren't able to attend the MEC.
If you don't want to download all the videos individually, you can find a download tool here that will do the work for you:
