Closure for Michael Ballmer started about eight weeks ago.

I posted on social media a message that it's now time for people to say goodbye.

Doctors told Michael his colon cancer is terminal. But one phone call from an old colleague who works in AI changed his perspective on saying goodbye.

And I spoke to him and said, Michael, I've been working on this thing called Eternos, and I explained, he goes, Oh, I've been thinking like, what if I could be an AI? I didn't think it was possible.

Robert Lacazio has spent a year developing the technology behind Eternos. Life.

I thought about how do you really replicate someone and especially their emotional voice.

He got to work capturing Michael's voice and memories.

A small phrase like, Hey, how are you today? Or, Oh, no kidding. That happened to you? And then stories about the different parts of my life, early part, middle part, late part.

We capture all that, and then we make that into an AI.

The final product blew Michael away.

And he was just like, wow. But he said, hang on one second. Let me get my wife. She'll be the real testist. And she came in. She started to speak with it.

Hello, Annette.

I'm so glad to have the opportunity to chat with you. You bring so much joy and happiness into my life, and I want you to know how much I appreciate you. Your presence brightens up my day.

We all cried. I was like, I've been in technology for 30 years, but I've never been in a place where that humanity and technology and the emotion of it. And she was just thinking, My God, it's him.

For the technologically minded Michael.

I'm not a memoir writer at all.

Who has always enjoyed his role as the family storyteller.

This now gives me the opportunity to leave something behind.

He's at peace knowing a part of his voice and memories can be passed on.

We visited Tahiti, Moraya, and Pora Bora, and it was such an incredible experience. The crystal clear turquoise waters, the stunning overwater bungalows. We had the chance to relax, explore, and create beautiful memories together. I still love reminiscing about that trip and all the special moments we shared.

I feel closer, but at least from the preparation, I prepared everything I was able to prepare for it to be able to be passed on.

Priya Schreither, NBC News.

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