Microsoft has said that over 50 per cent of Windows Phone 7 users now have access to the new version: Windows Phone 7 Mango.

"Hello everyone. Six days ago we started rolling out the Windows Phone 7.5 Mango update around the globe," writes Eric Hautala, general manager of customer experience engineering at Microsoft on the company’s Windows Phone blog. "Within the first hours of making it available, we saw successful updates in every country, on every carrier, and for nearly every Windows Phone model."

According to Hautala, that roll out has been so successful that it's been able to open up the update to even more users ahead of schedule.

"The update success rates we’re seeing look so good we’ve decided to open the spigot ahead of schedule, and make Windows Phone 7.5 available to 50 percent of eligible customers starting right now."

Microsoft says that it hasn’t opened it up to all users as it is still wanting to make sure the update goes smoothly.

Detailing how the update actually happens Hautala says that there is no conspiracy theory or specific reason as to who gets the update:

"Put simply, it’s done totally at random, with absolutely no preference for carrier, model, or country. Random sampling is an important engineering technique to accurately measure quality and pinpoint issues early. In some cases, this can have interesting consequences: A family, for example, can have identical Windows Phones, yet only one phone might get an update notification."

How are you getting on? Let us know in the comments below.

Windows Phone 7 Mango review