

The two programs do not share a common codebase, but do share a common architectural philosophy. Outlook Express is a diverse application from Microsoft Office Outlook. Microsoft Entourage, sold as part of Microsoft Office for Macintosh, has changed the Macintosh version.
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In Windows Vista, Outlook Express was outdated by Windows Mail, then again by Windows Live Mail as separate software in Windows 7.
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It is also bundled with a number of versions of Microsoft Windows, from Windows 98 to Windows Server 2003, and is available for Windows 3.x, Windows NT 3.51, Windows 95 and Mac OS 9. Outlook Express is an email and news client that is integrated with Internet Explorer versions 4.0 through 6.0.

These files contain information as well as the source of the email and whether the email has been edited or modified during transmission, which means users with these email management applications incorporated with P7S support can make sure that the emails they receive are genuine, are originating from trusted senders and are not tampered with, before they open and view the emails. Some of these email management applications include Microsoft Outlook 2010, PostBox and Mozilla Thunderbird. p7s extension are email messages utilized in email managing programs for sending, receiving or just simply viewing protected emails encrypted with digital signatures. It supports UNIX mailbox format (mbox), Mork which is utilized for internal database and SQLite also used for internal database (since version 3).

Additional features, if desired, are often available thru other extensions. The vanilla version is not a personal information manager, although the Mozilla Lightning extension adds PIM functionality. The project stratagem is modeled after Mozilla Firefox, a project aimed at generating a Web browser. Thunderbird is a free, open source email, newsgroup, news feed and chat (XMPP, IRC, Twitter) client created by the Mozilla Foundation.
