The HP ProBook  is a line of business-oriented laptop computers made by Hewlett-Packard (HP Inc.). HP marketed the ProBook series to business users; the list price was lower than that of HP's higher-end EliteBook series.
 In April 2009, HP introduced the ProBook s-series (standard/essential) notebooks, which consisted of the Intel powered 4410s, 4510s, and 4710s (14", 15.6", and 17.3" screens, respectively) and the AMD powered 4415s and 4515s (14" and 15.6" screens, respectively). This was followed by the introduction of the 13.3" ProBook 4310s in June of the same year. 
The s-series was updated in 2010 with Intel Core i3, i5, and i7 processors, a brushed aluminium case, chiclet keyboard, and multi-touch ClickPad. Updates to the line in 2012 included a new exterior aluminium design.
 The ProBook B-series was announced on October 13, 2009, replacing the previous HP Compaq B-series with similar design in early models. All models still have a CD drive bay, docking port, pointstick options, screen latches, draining holes, easy-replaceable battery with additional slice options, TPM chip, socketed CPU, WLAN options and 2 RAM slots.
 Two AMD powered models were announced in 2009 — the 14" ProBook 6445b and the 15.6" ProBook 6545b; Their Intel powered counterparts were announced three months later as the 14" ProBook 6440b and the 15.6" ProBook 6540b.; and the next-year upgrade is an AMD-powered 6455b and 6555b, and Intel-based 6450b and 6550b. 
The B-series design was updated in 2011 with the Intel-powered 6460b and 6560b, and the AMD-powered 6465b and in 2012 with the Intel-powered 6470b and 6570b, and the AMD-powered 6475b. The updated sibling EliteBook line had an additional magnesium frame under screen top lid, the keyboard LED-backlight, the aluminium bottom-cover, the 17" workstation version and the additional security options.
 HP launched the 5310m in September 2009 as a line of compact mid-range 12" and 13" ProBooks without CD-drive bay. The 5310m was enclosed by an aluminium and magnesium case, weighed under four pounds, and was less than an inch thick.  
The M-series was updated in September 2010 with a 5320m, closely followed with the release of the 5330m in May 2011 which featured a dual-tone aluminium chassis and Beats Audio.
 HP launched the G0 series in 2013. The computers are enclosed in an aluminium and magnesium case. The G1 series succeeded in 2014.
 The first digit is a class of laptop (4## — entry, 6## — mid-class models), second digit is a display size (#3# for 13.3", #4# for 14.1", #5# for 15.6" and #7# for 17.3"). The third is an additional mark, like a ##5 for AMD-based model.
 These are the ProBooks that have been released in Generation 0.
 This line has low-end siblings (15.6" HP 350 G1 and 14.1" HP 340 G1). The 4## models is entry line. and 6## is a mid-range models with aluminum and magnesium case.
 These are the ProBooks that have been released in Generation 2.
 These are the ProBooks that have been released in Generation 3.
 These are the ProBooks that have been released in Generation 4.
 These are the ProBooks that have been released in Generation 5.
 These are the ProBooks that have been released in Generation 6.
 These are the ProBooks that have been released in Generation 7.
 These are the ProBooks that have been released in Generation 8.
 445 G8
 These are the ProBooks that have been released in Generation 9.
 Competing laptop lines include: