SAN FRANCISCO – The heart of any ecosystem are developers. If they aren’t happy they won’t build applications, and without applications buyers have no reason to invest in a platform.

At its annual Build conference for developers here on Wednesday Microsoft Corp. made a number of announcements to keep its developers in the fold as well as capabilities to appeal to enterprises.

“Our vision, simply put is to thrive in this world of mobile first, cloud first,” said new CEO Satya Nadella. “There is going to be more ubiquitous computing everywhere and there’s going to be ambient intelligence everywhere … everything we do is going to be digitized… Our goal is to build platforms, create the best end-user experiences, the best developer opportunities and infrastructure for this ubiquitous computing world.”

In short, there were a wide range of announcements to keep almost everyone pleased.

They include

–updates to Windows 8.1 for desktop and the new Windows Phone 8.1 coming next month that will allow developers to more easily build apps that run across four of its platforms – the desktop, WinPhone, Windows tablets and the Xbox gaming system. Microsoft dubs these universal Windows apps.

An update to Visual Studio 13 will help developers with this, if they chose to use that tool;

–for businesses, WinPhone 8.1 update will  support enterprise VPNs for more secure communications, plus support for  S/MIME so users can can read and write encrypted email;

–Cortana, a Siri-like personal digital assistant for WinPhone 8.1, that replaces the search button. Not only can it do the usual thinks like schedule events and reminder, it can be linked to third party apps. Cortana also keeps things it learns from user patterns in a editable notebook so with headings like “remind me,” “inner circle” (people) it infers from your interactions, “quiet hours.” Because the notebook file is editable users can easily correct mistakes.

Cortana — which leverages Microsoft Bing for searches so it’s country-specific — is in beta now and will be in full release later in the year in the U.S. There’s no word on when it comes to Canada;