A summary of all major announcements on “Day One” of the Microsoft 2015 BUILD conference are summarized in link below:

http://thenextweb.com/insider/2015/04/29/everything-microsoft-announced-at-its-build-developer-conference-day-1/

Key topical areas include:

.NET Core preview opens to Mac and Linux
Visual Studio Code goes live
New Azure services arrive
Office Graph API allows cross-platform integrations for Office 2016
WINDOWS 10 news!
Run universal Windows apps on desktop
Android and iOS apps arrive on Windows 10
Spartan browser gets an official name: Microsoft Edge
Windows 10 continuum for phones
Windows Holographic demo