Founded in 1985 in Taipei, E-TEN initially became known for its Chinese language input system for DOS based computers. The company went on to introduce various computer products, both computer hardware and software, building on its experience in rendering Chinese characters. Market offerings included a publishing application, a laser printer, and a Microsoft Windows-based input system.
E-TEN turned to handheld devices in 1997, with the introduction of a real-time stock trading "financial pager" that became quite popular in the financial community of Taiwan. Then the company focused on manufacturing advanced communicators (both branded and ODM) based on the Microsoft Windows Mobile, as well as DAB receivers.
In 2006, E-TEN introduced their new Glofiish line of smartphones; the X500 and M700. Both models featured GSM, Bluetooth, Wi-Fi and GPS. First Glofiish Model with 3G support is the X800, which is released Q3 2007, followed by the M800 with a sliding keyboard released shortly after.
E-TEN was awarded the Best Choice of Computex Award 2008 for its Glofiish DX900 – the first dual-SIM Windows Mobile handset to support HSDPA and EDGE. The DX900 was showcased at the E-TEN booth along with three more Pocket PC phones - the V900, the X900, and the X610. Russia was the most successful market for E-TEN products. The company had significant market share there - up to 20.52% (Q1 2008), making it one of the few markets where HTC Corporation was not a market leader in Windows Mobile-based devices 
In March, 2008 Acer announced that it would buy E-TEN for $290 million (US). Acer chairman J.T. Wang stated that the "acquisition of E-TEN increases Acer's global footprint by giving us a strong and highly credible presence in the mobility segment." After the buyout, the E-TEN brand was discontinued, and the Acer name was used on all future products.
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