Segoe UI is a unique Windows source. If someone using Linux or Mac opens your site, the default system font will appear.
I recommend that you use the Open Sans font, which somewhat resembles the Segoe UI font and is available on Google Fonts. Just link the CSS.
More information: link
To use the normal and bold Open Sans font, simply insert in the HTML code:
<link href='https://fonts.googleapis.com/css?family=Open+Sans:400,700' rel='stylesheet' type='text/css'>
However, if you really want everyone to see the Segoe UI source independent of the operating system, simply embed the source using @font-face
. See the CSS of the Microsoft website:
link
But due to licensing issues, it seems that only Microsoft sites can incorporate the Segoe UI source.