Three-pane interface

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The three-paned main window of Mozilla Thunderbird. Mozilla-thunderbird-3.0.1.png
The three-paned main window of Mozilla Thunderbird.

A Three-pane interface is a category of graphical user interface in which the screen or window is divided into three panes displaying information. This information typically falls into a hierarchal relationship of master-detail with an embedded inspector window. Microsoft's Outlook Express email client popularized a mailboxes / mailbox contents / email text layout that became the norm until web-based user interfaces rose in popularity during the mid-2000s. Even today, many webmail scripts emulate this interface style.

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A file manager or file browser is a computer program that provides a user interface to manage files and folders. The most common operations performed on files or groups of files include creating, opening, renaming, copying, moving, deleting and searching for files, as well as modifying file attributes, properties and file permissions. Folders and files may be displayed in a hierarchical tree based on their directory structure.

Email client Computer program used to access and manage a users email

An email client, email reader or, more formally, message user agent (MUA) or mail user agent is a computer program used to access and manage a user's email.

Microsoft Outlook Email client, task and calendar management software developed by Microsoft

Microsoft Outlook is a personal information manager software system from Microsoft, available as a part of the Microsoft Office suite. Though primarily an email client, Outlook also includes such functions as calendaring, task managing, contact managing, note-taking, journal logging, and web browsing.

Outlook Express

Outlook Express, formerly known as Microsoft Internet Mail and News, is a discontinued email and news client included with Internet Explorer versions 3.0 through to 6.0. As such, it was bundled with several versions of Microsoft Windows, from Windows 98 to Windows Server 2003, and was available for Windows 3.x, Windows NT 3.51, Windows 95, Mac System 7, Mac OS 8, and Mac OS 9. In Windows Vista, Outlook Express was superseded by Windows Mail.

Apple Mail is an email client included by Apple Inc. with its operating systems macOS, iOS and watchOS. Apple Mail grew out of NeXTMail, which was originally developed by NeXT as part of its NeXTSTEP operating system, after Apple's acquisition of NeXT in 1997.

An email address identifies an email box to which messages are delivered. While early messaging systems used a variety of formats for addressing, today, email addresses follow a set of specific rules originally standardized by the Internet Engineering Task Force (IETF) in the 1980s, and updated by RFC 5322 and 6854. The term email address in this article refers to addr-spec in RFC 5322, not to address or mailbox; i.e., a raw address without a display-name.

Contacts (Apple)

Contacts is a computerized address book included with the Apple operating systems iOS, iPadOS and macOS, previously Mac OS X and OS X. It includes various cloud synchronization capabilities and integrates with other Apple applications and features, including iMessage, FaceTime and the iCloud service.

Pegasus Mail

Pegasus Mail is a proprietary email client developed by David Harris. It was originally released in 1990 for internal and external mail on NetWare networks with MS-DOS and later Apple Macintosh clients. It was subsequently ported to Microsoft Windows, which is now the only platform actively supported. Previously freeware, Pegasus Mail is now donationware.

Yahoo! Mail American email service

Yahoo! Mail is an email service launched on October 8, 1997, by the American company Yahoo, Inc. It offers four different email plans: three for personal use and another for businesses. As of January 2020, Yahoo! Mail has 225 million users.

The MH Message Handling System is a free, open source e-mail client. It is different from almost all other mail reading systems in that, instead of a single program, it is made from several different programs which are designed to work from the command line provided by the shell on Unix-like operating systems. Another difference is that rather than storing multiple messages in a single file, messages each have their own separate file in a special directory. Taken together, these design choices mean that it is very easy and natural to script actions on mail messages using the normal shell scripting tools.

AOL OpenRide

AOL OpenRide was an Internet application suite made by AOL from 2006, combining e-mail, instant-messaging, a web browser and a media player in one window. The suite was available for free download, but an AOL or AIM screenname was required to access some features.

Windows Fax and Scan

Windows Fax and Scan is an integrated faxing and scanning application introduced in Windows Vista and included in the Business, Enterprise, and Ultimate Windows Vista editions as the replacement for the Fax Console of Windows XP; it is available in all versions of Windows 7, Windows 8, Windows 10 and Windows 11.

Sidebar (computing)

The sidebar is a graphical control element that displays various forms of information to the right or left side of an application window or operating system desktop. Examples of the sidebar can be seen in the Opera web browser, Apache OpenOffice, LibreOffice, SoftMaker Presentations and File Explorer; in each case, the app exposes various functionalities via the sidebar.

Windows Live Mail

Windows Live Mail was a freeware email client from Microsoft. It is the successor to Windows Mail in Windows Vista, which was the successor to Outlook Express in Windows XP and Windows 98. Windows Live Mail is designed to run on Windows 7 and Windows Server 2008 R2, but is also compatible with Windows 8 and Windows 10, even though Microsoft bundles a new email client, named Windows Mail, with the latter.

Outlook.com Microsoft web consumer software

Outlook.com is a personal information manager web app from Microsoft consisting of webmail, calendaring, contacts, and tasks services. Founded in 1996 by Sabeer Bhatia and Jack Smith as Hotmail, it was acquired by Microsoft in 1997 for an estimated $400 million and relaunched as MSN Hotmail, later rebranded to Windows Live Hotmail as part of the Windows Live suite of products. Microsoft phased out Hotmail in October 2011, relaunching the service as Outlook.com in 2012.

GroupWise

GroupWise is a messaging and collaboration platform from Micro Focus that supports email, calendaring, personal information management, instant messaging, and document management. The GroupWise platform consists of desktop client software, which is available for Windows, Mac OS X, and Linux, and the server software, which is supported on Windows Server and Linux.

ProtonMail end-to-end encrypted email service

ProtonMail is an end-to-end encrypted email service founded in 2013 in Geneva, Switzerland by scientists who spent time at the CERN research facility. ProtonMail uses client-side encryption to protect email content and user data before they are sent to ProtonMail servers, unlike other common email providers such as Gmail and Outlook.com. The service can be accessed through a webmail client, the Tor network, or dedicated iOS and Android apps.

Mail (Windows) Conflation of two applications developed by Microsoft

Mail is an email client developed by Microsoft and included in Windows Vista and later versions of Windows. The main function of Mail is sending and receiving email. It is available as the successor to Outlook Express, which was either included with, or released for Internet Explorer 3.0 and later versions of Internet Explorer.

Calendar (Windows)

Calendar is a personal calendar application made by Microsoft for Microsoft Windows. It offers synchronization of calendars using Microsoft Exchange Server, Outlook.com Apple's iCloud calendar service, and Google Calendar. It supports the popular iCalendar format.

People (Windows) Contact management app and address book in Windows 8 and 10

People is a contact management app and address book included in Microsoft's Windows 8 and 10. It allows a user to organize and link contacts from different email accounts. People has a unique graphical interface, unlike Windows Contacts' File Explorer-based interface, based on the Metro design language that had already been used for Outlook.com and the integrated online People service. In addition to being an address book, it provides a list of recent mail conversations with a selected contact. It used to also be a social media hub, in which users could integrate their social networking accounts, but API changes in both Windows and social media services caused this functionality to break.