ThinkCentre M series
model series of desktop computers by IBM and Lenovo

The M-series of desktops are part of Lenovo's ThinkCentre product line. Lenovo has released M-series desktops in multiple form factors, ranging from traditional tower, small form factor, to ultra small form factor, and all-in-ones (AIOs). Formerly an IBM brand, Lenovo acquired the ThinkCentre desktop brand following its purchase of IBM's Personal Computing Division (PCD) in 2005.
2003
In 2003, IBM redesigned and re-launched their ThinkCentre product line. The first desktop released was an M-series desktop – the M50.
M50
The first desktop in IBM's redesigned ThinkCentre line was the M50, announced in 2003. The desktop offered the following specifications:
Processor: Intel Pentium 4 3.0 GHz
RAM: 256 MB PC2700 DDR
Storage: 40 GB 7200 RPM
Graphics: Intel Extreme 2 (integrated, 64MB of shared video RAM)
Optical drive: 48x CD-ROM
Audio: SoundMAX Cadenza audio without speakers
Operating system: Microsoft Windows XP Professional
USB ports: eight USB 2.0 Ports
While the desktop was made available as a consumer PC, it was more suited to a corporate environment, with the limited storage and graphics capabilities.
2005
The ThinkCentre desktop released by Lenovo in 2005, following its acquisition of IBM's PCD was the M52.
M52
The ThinkCentre M52 desktop was announced in May 2005 following Lenovo's acquisition of IBM's Personal Computing Division. PC World called the M52 desktop, "A corporate machine for the security conscious business user looking for stability and reliability".
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