Windows 98

Windows 98 is an operating system developed by Microsoft as part of its Windows 9x family of Microsoft Windows operating systems. It is the successor to Windows 95, and was released to manufacturing on May 15, 1998, and generally to retail on June 25, 1998. Like its predecessor, it is a hybrid 16-bit and 32-bit monolithic product with the boot stage based on MS-DOS. Windows 98 is a heavily web-integrated operating system that bears numerous similarities to its predecessor, with most of the improvements being cosmetic or designed to improve the user experience, but there are a handful of features that enhance system functionality and capabilities. These include improved USB support and accessibility, as well as support for hardware advancements such as DVD players. It was the first Windows operating system to adopt the Windows Driver Model. It also introduced features that would become standard in future generations of Windows, such as Disk Cleanup, Windows Update, multi-monitor support, and Internet Connection Sharing.

Microsoft had marketed Windows 98 as a "tune-up" to Windows 95, rather than an entirely improved next generation of Windows. Upon release, it was generally well received for its web-integrated interface and ease of use, as well as for addressing issues that had been present in Windows 95, though users had pointed out that it was not significantly more stable than its predecessor. It saw one major update called Windows 98 Second Edition (SE) on May 5, 1999, and was succeeded by Windows Me in 2000. It sold an estimated 58 million licenses, and Microsoft ended mainstream support for both Windows 98 and 98 SE on June 30, 2002, and ended extended support on July 11, 2006.

Web integration and shell enhancements
The first release of Windows 98 included Internet Explorer 4.01. This was updated to 5.0 in the Second Edition. Besides Internet Explorer, many other Internet companion applications are included such as Outlook Express, Windows Address Book, FrontPage Express, Microsoft Chat, Personal Web Server and a Web Publishing Wizard, and NetShow. NetMeeting allows multiple users to hold conference calls and work with each other on a document.

The Windows 98 shell is web-integrated; it contains deskbands, Active Desktop, Channels, ability to minimize foreground windows by clicking their button on the taskbar, single-click launching, Back and Forward navigation buttons, favorites, and address bar in Windows Explorer, image thumbnails, folder infotips and Web view in folders, and folder customization through HTML-based templates. The taskbar supports customizable toolbars designed to speed up access to the Web or the user's desktop; these toolbars include an Address Bar and Quick Launch. With the Address Bar, the user accesses the Web by typing in a URL, and Quick Launch contains shortcuts or buttons that perform system functions such as switching between windows and the desktop with the Show Desktop button. Another feature of this new shell is that dialog boxes[clarification needed] show up in the Alt-Tab sequence.

Windows 98 also integrates shell enhancements, themes and other features from Microsoft Plus! for Windows 95 such as DriveSpace 3, Compression Agent, Dial-Up Networking Server, Dial-Up Scripting Tool and Task Scheduler. 3D Pinball Space Cadet is included on the CD-ROM, but not installed by default. Windows 98 had its own separately purchasable Plus! pack, called Plus! 98.

Title bars of windows and dialog boxes support two-color gradients, a feature ported from and refined from Microsoft Office 95. Windows menus and tooltips support slide animation. Windows Explorer in Windows 98, as in Windows 95, converts all-uppercase filenames to sentence case for readability purposes; however, it also provides an option Allow all uppercase names to display them in their original case. Windows Explorer includes support for compressed CAB files. The Quick Res and Telephony Location Manager Windows 95 PowerToys are integrated into the core operating system.

Windows 98 Second Edition
Windows 98 Second Edition (often shortened to Windows 98 SE and sometimes to Win98 SE) is an updated release of Windows 98, released on May 5, 1999. It includes many bug fixes, improved WDM audio and modem support, improved USB support, the replacement of Internet Explorer 4.0 with Internet Explorer 5.0, Web Folders (WebDAV namespace extension for Windows Explorer), and related shell updates. Also included is basic OHCI-compliant FireWire DV camcorder support (MSDV class driver) and SBP-2 support for mass storage class devices. Wake-On-LAN reenables suspended networked computers due to network activity, and Internet Connection Sharing allows multiple networked client computers to share an Internet connection via a single host computer. Other features in the update include DirectX 6.1 which introduced major improvements to DirectSound and the introduction of DirectMusic, improvements to Asynchronous Transfer Mode support (IP/ATM, PPP/ATM and WinSock 2/ATM support), Windows Media Player 6.1 replacing the older Media Player, Microsoft NetMeeting 3.0, MDAC 2.1 and WMI. A memory overflow issue was resolved which in the older version of Windows 98 would crash most systems if left running for 49.7 days (equal to 232 milliseconds). Windows 98 SE could be obtained as retail upgrade and full version packages, as well as OEM and a Second Edition Updates Disc for existing Windows 98 users. USB audio device class support is present from Windows 98 SE onwards. Windows 98 Second Edition improved WDM support in general for all devices, and it introduced support for WDM for modems (and therefore USB modems and virtual COM ports). Microsoft driver support for both USB printers, and for USB mass-storage device class is not available for Windows 98.