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Hello and welcome to TechTent, your weekly guide to all the hottest news and trends in the

technology business.

I'm Rory Ketland-Jones, and this week an attack on Microsoft's email program is being described as a global cybersecurity crisis with so-called zero-day vulnerabilities sparking alarm.

We'll explain exactly what they are.

A digital artist has made millions of dollars by selling

not his art, but a digital certificate, signifying ownership of it. We ask him what that's all about.

And how virtual reality is being used to fight corruption in Nigeria. Joining me this week is

BBC tech reporter Jane Wakefield. Jane, what do you been up to?

Well, I've been learning about the Metaverse, which is part of something we'll talk about later,

all to do with Roblox and how we're all going to be living in digital spheres in future, Rory.

I feel I'm already living in a digital sphere and we'd quite like to get back to the real world. But there we go.

Here's a flavor of what's coming up.

...