What does Digit Zero look like on Microsoft?

On Microsoft it is the design shipped in Windows 10 Anniversary Update, shown above at full size. Older revisions are listed beneath it.

When did Microsoft add Digit Zero?

Microsoft first drew Digit Zero in Windows 8.0, released October 26, 2012.

Microsoft Corporation has shipped 4 versions of Digit Zero. Each is dated, so you can see when the design changed.

Microsoft Windows 8.1

This is the design Microsoft introduced in Windows 8.0, shipped again unchanged. It was not redrawn for this release.

✳ marks a release that redrew this emoji. The rest re-shipped the design unchanged.

What does Digit Zero look like on Microsoft?: On Microsoft it is the design shipped in Windows 10 Anniversary Update, shown above at full size. Older revisions are listed beneath it.
When did Microsoft add Digit Zero?: Microsoft first drew Digit Zero in Windows 8.0, released October 26, 2012.
How many times has Microsoft redrawn Digit Zero?: Microsoft Corporation has shipped 4 versions of Digit Zero. Each is dated, so you can see when the design changed.