TAIPEI—Taiwanese personal computer maker Acer Inc. said it plans to offer fewer Microsoft Inc. products and more Chromebooks and Android-based mobile devices, after it posted a surprise second-quarter loss on lower sales and rising expenses.

"We are trying to grow our non-Windows business as soon as possible," President Jim Wang told investors in a conference call. "Android is very popular in smartphones and dominant in tablets…I also see a new market there for Chromebooks."

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