Microsoft Outlook Express

Outlook Express is an email and news client that is integrated with Internet Explorer versions 4.0 through 6.0. 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. In Windows Vista, Outlook Express was outdated by Windows Mail, then again by Windows Live Mail as separate software in Windows 7. Microsoft Entourage, sold as part of Microsoft Office for Macintosh, has changed the Macintosh version. Outlook Express is a diverse application from Microsoft Office Outlook. The two programs do not share a common codebase, but do share a common architectural philosophy. The similar names lead many people to incorrectly conclusion that Outlook Express is a stripped-down version of Microsoft Office Outlook. Outlook Express utilizes the Windows Address Book to store contact information and incorporates tightly with it. On Windows XP, it also joins together with Windows Messenger.

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Mozilla Thunderbird

Thunderbird is a free, open source email, newsgroup, news feed and chat (XMPP, IRC, Twitter) client created by the Mozilla Foundation. The project stratagem is modeled after Mozilla Firefox, a project aimed at generating a Web browser. The vanilla version is not a personal information manager, although the Mozilla Lightning extension adds PIM functionality. Additional features, if desired, are often available thru other extensions. It supports UNIX mailbox format (mbox), Mork which is utilized for internal database and SQLite also used for internal database (since version 3). Files that bear the .p7s extension are email messages utilized in email managing programs for sending, receiving or just simply viewing protected emails encrypted with digital signatures. Some of these email management applications include Microsoft Outlook 2010, PostBox and Mozilla Thunderbird. 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.

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Microsoft Office Outlook

Microsoft Outlook is available as a part of the Microsoft Office suite, and a personal information manager from Microsoft. The present version is Microsoft Office Outlook 2010 for Windows and Microsoft Office Outlook 2011 for Mac. Although frequently used primarily as an email application, it also includes a calendar, task manager, contact manager, note taking, a journal and Web browsing. It can be utilized as a stand-alone application, or can work with Microsoft Exchange Server and Microsoft SharePoint Server for many users in an organization, such as shared mailboxes and calendars, exchange public folders, SharePoint lists and meeting schedules. There are third-party add-on applications that integrate Outlook with electronic devices such as BlackBerry mobile phones and with other software like Office & Skype Internet communication. Developers can also make their own conventional software that works with Outlook and Office components using Microsoft Visual Studio. Moreover, Windows Mobile devices can synchronize almost all Outlook data to Outlook Mobile.

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