share of the world population using the internet grew from 6.7% to 25.7%. A huge jump in broadband internet usage globally – for example, from 6% of U.S. internet users in June 2000 to what one mid-decade study predicted would be 62% by 2010. By February 2007, over 80% of U.S. Internet users were connected via broadband and broadband internet has been almost a required standard for quality internet browsing. Wireless internet became prominent by the end of the decade, as well as internet access in devices besides computers, such as mobile phones and gaming consoles. Email became a standard form of interpersonal written communication, with popular addresses available to the public on Hotmail (now Outlook.com), Gmail and Yahoo! Mail. Normalisation became increasingly important as massive standardized corpora and lexicons of spoken and written language became widely available to laypeople, just as documents from the paperless office were archived and retrieved with increasing efficiency using XML-based markup. Peer-to-peer technology gained massive popularity with file sharing systems enabling users to share any audio, video and data files or anything in digital format, as well as with applications which share real-time data, such as telephony traffic. VPNs (virtual private networks) became likewise accessible to the general public, and data encryption remained a major issue for the stability of web commerce. Boom in music downloading and the use of data compression to quickly transfer music over the Internet, with a corresponding rise of portable digital audio players. As a result, the entertainment industry struggled through the decade to find digital delivery systems for music, movies, and other media that reduce copyright infringement and preserve profit. The USB flash drive replaces the floppy disk as the preferred form of low-capacity mobile data storage. In February 2003, Dell announced floppy drives would no longer be pre-installed on Dell Dimension home computers, although they were still available as a selectable option and purchasable as an aftermarket OEM add-on. On January 29, 2007, PC World stated that only 2% of the computers they sold contained built-in floppy disk drives; once present stocks were exhausted, no more standard floppies would be sold. During the decade, Windows 2000, XP, Microsoft Office 2003, Vista and Office 2007 (and later Windows 7) become the ubiquitous industry standards in personal computer software until the end of the decade, when Apple began to slowly gain market share. Windows ME and Microsoft Office XP