| Clue | Source | Date |
|---|---|---|
| Web service since 1993 | LA Times Daily | 08 Jan 2021 |
| Web service since 1993 | The Washington Post | 08 Jan 2021 |
| Outlook alternative | LA Times Daily | 27 Jun 2019 |
| Outlook alternative | The Washington Post | 27 Jun 2019 |
| Outlook alternative | ||
| Outlook alternative | Wall Street Journal | 21 Mar 2017 |
| Outlook alternative | ||
| Cybermessaging service | ||
| Message-sending option since 2004 |