The HP ProBook is a brand of affordable business notebooks made by Hewlett-Packard

Hewlett-Packard

Hewlett-Packard Company or HP is an American multinational information technology corporation headquartered in Palo Alto, California, USA that provides products, technologies, softwares, solutions and services to consumers, small- and medium-sized businesses and large enterprises, including...

. The ProBook series are aimed at mainstream business users and are cheaper than the higher-end EliteBook

HP EliteBook

HP EliteBook is a brand of premium business-class notebooks and mobile workstations made by Hewlett-Packard. The EliteBook series, which slots above the lower-end ProBook series, was introduced in August 2008.-Features:...

series.

S-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 a year later with Intel Core i3, i5, and i7 processors, a brushed aluminum case, chiclet keyboard, and multitouch ClickPad.

M-Series

HP launched the 5310m in September of 2009. The 5310m was enclosed by an aluminum and magnesium case, weighed under four pounds, and was less than an inch thick. The m-series was updated in May of 2011 with the release of the 5330m which featured a dual-tone aluminum chassis and Beats Audio.

Timeline

Hewlett-Packard ProBook Release Timeline
Screen size	Series	2009	2010	2011
12.1"	s-series			4230s
13.3"	s-series	4310s	4320s	4330s
	m-series	5310m		5330m
	b-series			6360b
14"	s-series	4410s/4415s	4420s	4430s
	b-series	6440b/6445b		6460b
15.6"	s-series	4510s/4515s	4520s	4530s
	b-series	6540b/6545b		6560b
17.3"	s-series	4710s	4720s	4730s