Microsoft's Vice-President for Windows Phone Program Management Joe Belfiore gestures during the "Windows phone 7" presentation
Mango is slated to be released before the end of the year, with Windows Phone Developer Tools kits available to developers starting in May. REUTERS

The first major update to Microsoft's Windows Phone 7, dubbed 'NoDo', only adds a handful of new updates, but if a report from Winrumors is any indication, Microsoft is taking the update very seriously.

Both Vodafone and Orange have confirmed that Microsoft is taking its time rolling out updates to their phones. The U.K.'s Vodafone says that it has already approved of the updates for the HTC 7 Trophy and LG Optimus 7 and that it is waiting on Microsoft to distribute them.

Orange, which also operates out of the UK, reported the same, noting that Microsoft's plan is to release the update starting on March 29. WinRumors also spoke to another European carrier, which said Microsoft was treading slowly with updates to Windows Phone 7 devices.

That's to be expected, as Microsoft is still recovering from a botched release of its Windows Phone 7 update. The update, which was released in February, was meant to set the stage for the DoMo update, but instead rendered some users' phones inoperable. Microsoft soon pulled the update before releasing a fix a few days later. The company is likely slowing down the NoDo update process in an attempt to avoid repeating its February debacle.

Microsoft released a chart detailing when American Windows Phone 7 users could expect updates to hit their phones. Tests on the HTC Surrounding, LG Quantum, and Samsung Focus are ongoing, according to the chart. Microsoft says it is scheduling the updates for Dell's Venue Pro and the HTC HD7.