What does Asterisk 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 Asterisk?

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

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

Microsoft Windows 10

Microsoft shipped a new design for Asterisk in Windows 10, released July 29, 2015. The previous design is shown beside it.

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

What does Asterisk 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 Asterisk?: Microsoft first drew Asterisk in Windows 8.0, released October 26, 2012.
How many times has Microsoft redrawn Asterisk?: Microsoft Corporation has shipped 4 versions of Asterisk. Each is dated, so you can see when the design changed.