[willyyr]

There is an option to delete all diagnostic data collected (Windows 10 1803). You can find it under Settings->Privacy-> Diagnostics & feedback-> Delete diagnostic data. As others have mentioned you can access and manage it using the portal that is linked.*

* I work at Microsoft.

[Krasnol]

Would that delete the data that has already been transferred to Microsoft?

And as others mentioned: the portal is useless for people without MS account. What about those?

[willyyr]

That's exactly what this option does. It deletes everything that has been collected up until that point.

[Krasnol]

Thank you.

[tmikaeld]

How can i delete all my skype history that's clearly on your servers?

[ionised]

Why not allow to me to stop that collection in the first place?

[mulletbum]

You can, what do you see on your report that you want to stop?

[ionised]

> You can.

How? Unless you have Windows 10 Enterprise Microsoft will not allow you to opt-out of basic telemetry.

> What do you see on your report that you want to stop?

Why does that matter?