Good Technology develops software that allows enterprises to push email to mobile phones.
The software allows customers to provide the functionality of a BlackBerry on a standard mobile phone, and is used by more than 12,000 enterprises worldwide.
Motorola said it expects the acquisition to help it broaden its product portfolio. The vendor sells handsets including the Motorola Q that are targeted at businesses, as well as equipment for telecoms providers.
The two vendors already had a business partnership involving the Motorola Q.
Good Technology has received more than $200m in venture capital over the past six years.
The acquisition, expected to close early next year, signals a heating up of the mobile email market. Nokia acquired Intellisync in a similar move earlier this year and added the software to its mobile phones.
"The timing is right for a more powerful attack against BlackBerry as competitive forces converge," said Sean Ryan, research analyst for mobile markets at IDC.
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