I was asked how to add a custom column with Hyperlink type on an out-of-box contact list so that the custom hyperlink would display a full name while the link will contain an email address. A calculated column cannot solve this problem because SharePoint converts any anchor tags in any hyperlink in a calculated column from .. to <a href=...>..</a> to protect from malicious script attackes. The problem was solved by using a HyperLink column instead of a calculated col