Microsoft has finally decided to throw some light on how and when the Windows Phone 7 March NoDo updates would be pushed out to WP7 customers worldwide.

This table provides update status for Windows Phone customers in the U.S. Find your phone model, then check to see what stage your update is in.

The terms being used are Testing, Scheduling, and Delivering Updates … rather vague! But here’s what each term means:

• Stage 1: Testing. The software update is undergoing mobile operator network and quality tests.
• Stage 2: Scheduling. Operator testing is complete, and Microsoft is scheduling the update for delivery. This phase typically lasts 10 days or less.
• Stage 3: Delivering update. Microsoft has started to send out the update. Because updates are typically delivered to customers in batches, it might take several weeks before you receive notice that an update is available for you.

To see the update status for Windows Phone 7 customers outside the US, click here.