Build 2015 keynote live blog: Windows 10, HoloLens, Office, Lumia and more

Satya Nadella back on stage to say goodbye. No mention of a Windows 10 launch date or new Lumia smartphone but there is always tomorrow. Thanks for tuning in folks. I'm off to try out HoloLens.

Microsoft has brought 100s of HoloLens devices to Build 2015 to allow developers to see it in action

"At some point in time you get the feeling you are creating something really important" Alex Kipman

HoloLens can allow you to bring up controls and schematics from your connected device and change them right there without having to return to your desk.

Now on stage is a robot powered by Raspberry Power 2 and using HoloLens to overlay a holographic robot on top of a physical one

All Windows 10 universal apps will run on Microsoft's Holographic computing platform on HoloLens.

Now, we've got a video about the HoloLens giving more details about the hardware itself

Now a demo of how the HoloLens can be used to teach medical students about the physiology of the body

Sorry for the lack of updates, but Microsoft has been showing off HoloLens and its pretty incredible. Now showing off how HoloLens can be used by architects to show clients how a building will look or solving problems on site.

Alex Kipman (he of HoloLens fame) is on stage....

Smartphones could be used to connect to a screen, keyboard and mouse for effective hot-desking.

Smartphone being mirrored on a screen and connected to Bluetooth keyboard and mouse. Phone homescreen appears as Start menu and apps run as if native to desktop - which they are in a way as its the same codebase for phone and desktop apps on Windows 10. Will your phone replace your laptop?

Belfiore now showing off Continuum for phones for the first time. Says Microsoft needs new hardware to get this working but it doesn't have it yet.

Myerson now talking about the continuum feature which allows apps change to reflect what mode you are in (tablet, desktop etc)

Belfiore showing off the new tab page on the Microsoft Edge which features news, weather, stocks, recently opened tabs, featured apps etc.

Now onto Project Spartan which will be called MICROSOFT EDGE

Cortana will be deeply integrated with apps. Allowing you open apps and even execute commands in apps - using Viber as an example

Now onto Cortana

Belfiore talking about how Windows 10 will prompt you to use features (Cortana, paint apps) by surfacing them after a length of time of no use. Called Spotlight, it will give users direct links to apps.

Belfiore now showing off the latest build of Windows 10, with some tweaks to the Start menu

Joe Belfiore now on stage

All attendees getting a HP Spectre x360 two-in-one device to help them develop for the platform.

Big news. iOS apps (written in Objective C) will also be easily ported to Windows.

Myerson specifically mentioned Windows 10 phones which will use the ported Android apps.

Here we go. Microsoft announces ability for developers to use almost all code from Android apps to put apps in Windows Store.

Myerson showing off Win32 app Adobe Photoshop Elements by putting Joe Belifiore's hair on Scott Guthrie's head.

Microsoft adding the ability to bring .Net and Win32 apps into the store.

Myerson has announced that developers can simply wrap their websites and put them in the Windows Store as apps.

Myerson's presentation has not been great so far. Lots of slip ups and spoonerisms. "Drog and drap" was my favourite

Myerson just called TriviaCrack, TriviaCrap. LOL

Next up is Tencent's popular WeChat app which will run not only on smartphones but also PC, allowing you to drag and drop content into messages

Demo time. Showing off the USA Today universal app running across phone, tablet, PC and Xbox. Myerson said it took just one hour to add Xbox capability on Windows 10 app.

Myerson says that within two-three years after release, there will be one billion devices running Windows 10 which will be far beyond anything from Android or iOS

Windows Store for Business launched to allow companies/schools create customs app stores for devices running Windows 10

Myseron pointing out that unlike Apple or Android, you don't have to develop two apps for mobile and desktop.

Myerson running though the benefits for developers. Write once (a single binary) for a huge range of devices. Add Cortana or Xbox Live to any of your apps.

We have this aspiration that you will love to develop for Windows 10. We want to make it the most attractive development platform ever.

Terry Myerson now on stage to talk Windows 10

We now have a VERY LOUD video playing about Windows 10

Nadella talking up the single platform, single store aspect of Windows 10 to developers

"Everything from the Raspberry Pi to HoloLens is one unified platform" Nadella

OK, so it's finally time for Windows

Leffert showed off a nice integration with Uber and Outlook with the ride sharing service being able to grab your destination automatically from your email without you having to input it.

Add-ins from LinkedIn and Salesforce for Outlook being demoed on stage. Demonstrations moving very fast.

Now showing off Sway, the latest Office tool to create interactive tools.

Showing off Excel on Windows, browser, iPad and iPhone all with the same experience including apps from SAP

Rob Lefferts from the Office Extendability on stage to talk about developers building features directly into Office including SAP and DocuSign

Scott Guthrie is finally done talking about the cloud, and Satya is back on stage to talk about Office as a platform.

JustGiving on stage now to talk about leveraging the power of Azure cloud to help people give money to the causes they want to support by using analytics and machine learning

Guthrie now talking about how Azure's Data Warehouse is better than Amazon's Data Warehouse. A sort of "my warehouse is bigger than your warehouse".

Apparently, Microsoft has introduced something called Azure SQL Data Warehouse. There's even a video for it

After an exciting SQL database coding demo (by a woman it should be noted) Scott Guthrie is back to talk about data and analytics.

We are now one hour in, and everything has been very developer focused so far.

Microsoft opening up Visual Studio to the Mac is representative of the new approach which Satya Nadella has implemented since taking over as CEO last year. Just like Office for iPad, making Visual Studio Code available on OS X is aimed at getting Microsoft tools and software into the hands of more people.

Scott Guthrie back on stage to say Visual Studio Code will be available to download from later today (Wednesday, 29 April) on all platforms.

Microsoft has announced Visual Studio Code, a free cross-platform code editor for OS X, Linux And Windows aimed at writing lightweight modern web and cloud applications.

Microsoft is still coding on stage and most of the press corp has turned toTwitter to complain that this developer conference is addressing developers

MOAR CODING

Raspberry Pi gets a mention on stage at Build

Build is a developer conference first and foremost and Microsoft is making that very apparent by going straight into dev testing demo on stage.

We're deep into developer stuff here, with Azure CTO on stage to show off some CODE...

Guthrie reveals that Microsoft is signing up more than 90,000 Azure customers every month

Microsoft has introduced more than 500 new Azure services since last year's Build conference according to Guthrie

This is a map showing the places around the world where Azure is present which Guthrie is bigger than AWS and Google Cloud combined

Next up on stage is head of cloud and enterprise Scott Guthrie to talk about Azure and building the intelligent cloud

Microsoft is going to talk about three main strands today. Its cloud platform, Office as a platform and finally the Windows 10 platform

Showing off a music notation app on Surface which recognises handwritten musical notation and converts it to digital instantly. Really clever and fast app

Musician David William Hearn now on stage, who calls himself an "accidental developer" and who is looking at how music notation is done digitally

Nadella is really excellent on stage

"Microsoft is a developer company and platform company first"

Nadella referencing Microsoft founders Bill Gates and Paul Allen who were the original developers and who, 40 years ago, wrote the first lines of code for BASIC

Speaking to developers: "All about challenging the creativity and ingenuity that you make possible on top of the platforms we make available to you."

Satya Nadella takes the stage

Here we go....

Microsoft is officially late to its own party...

Microsoft even has a grand piano set up in front of the stage. Whether Satya is going to show off his skill is unclear...

And we're in. Lots of loud techno beats but Microsoft has put on actual desks for the media with power and ethernet connections. Though considering the keynote is scheduled for two-and-a-half hours, we will need it.

Biggest cheers in the press room this morning has been for an announcement that there will be power and wired internet in the press section of the keynote...it's the little things.

It's getting busy here in the Moscone Center...30 minutes to kick off.

By the looks of the posters and decoration around the Moscone Center this morning, Office is going to be a major focus from Microsoft this year. Speaking to someone in the know, I am led to believe that the company will open up user information (over a billion people use the software) to developers to build on top of.

Lots of Microsoft Surfaces on show in the press room ahead of the keynote. Not sure if this is a case of playing teacher's pet or if they genuinely use them as work devices...

This morning, the latest rumour suggests that Microsoft will announce that Android apps will be able to run on Windows smartphones, tablets and laptops. The rumour comes from long-time Microsoft watcher Paul Thurrott, who has a solid track record in breaking this type of news about Microsoft.

Thurrott however is not very positive about the move, if it does happen:

As for the contents of the keynote, I am told to expect Windows 10 (obviously), some HoloLens (yeh), Office as a platform, Azure updates and some other announcements which are going to be a surprise.

And who doesn't love a surprise?......Journalists, that's who...

Microsoft has told me that its will be on time this morning and that unlike last year's bum-numbing four hour marathon, this year will be much more concise - which is a good thing for everyone.

It's a grey and chilly morning here in San Francisco, but things should begin to heat up in an hour's time when Satya Nadella is expected on stage to kick off this year's Microsoft developer conference known as Build.