What is the interview process like at Microsoft?

Lenghty and complicated interview process.
1st round with HR, basic screening stuff.
Another 4 rounds including Hiring Manager and 3 other people who had similar roles to the one I was applying for. The questions were scenario based asking how I would handle certain situations.
5th and last round was with some Executive.
After all interviews I had another call with HR to discuss expectations/benefits etc, however no offer was made.
A week later HR called back with an offer.
After accepting they initiated a background check, this took another 3 weeks.

It was relatively easy as I had already had the experience needed for the job. - The interview lasted about 15 minutes. I had a job offer before I was able to make it home.
However, It would have been a very difficult interview had I not already knew about the Localization process.

Typical phone interview

Team and Windows

All via phone

Very friendly, but you will go through a full day of technical interviews.

The interview process was brief. I sat in a room with ten other individuals and we were given a few questions. They explained that we were there out of recommendation or a pre-screening process which is why they selected our resumes over others. After an hour, we were all free to go and they gave us a callback if we received the position.

Short and they give you a prank phone call to see how well things would go.