Acer own PB, it's her low cost firm in Europe.
I'have recently read the Acer's strategy:
Acer is for SMB market and high end retail market
PB will be the low cost /low end familly market
Nec it's global market in Asia and maybe North America ?
Gateway is for Noth America, and completly away from EMEA
I don't know really the segment market of Gateway and NEC but I think Acer hope become a key player of business notebook.
and why not ? Their products are not so bad in high end.