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The N900 uses version 5 of Nokia's Maemo operating system, which Nokia said it sees as complementary to the Symbian platform it uses in its smartphones.
"The Nokia N900 shows where we are going with Maemo and we'll continue to work with the community to push the software forward," Nokia's markets chief Anssi Vanjoki said in a statement on Thursday. "What we have with Maemo is something that is fusing the power of the computer, the internet and the mobile phone, and it is great to see that it is evolving in exciting ways."
Like its predecessors, the N900 has a slide-out Qwerty keyboard.
The device comes with the Nokia Messaging service, which can support up to 10 email accounts, as well as an instant-messaging application.
The N900's browser is based on Mozilla technology. Nokia would not confirm the browser's precise name, although Mozilla has previously code-named its mobile browser project Fennec, and said the resulting application would simply be called Firefox, as on the desktop.
Full Adobe Flash 9.4 support is included, as is support for HTML 5 features.
The N900's 3.5-inch resistive touchscreen has a resolution of 800x480 pixels.
Inside, the device is powered by a 600MHz ARM Cortex-A8 processor. GPS is also included. Applications get around a gigabyte of memory, from the 256MB RAM and 768MB virtual memory, and can also use the N900's OpenGL ES 2.0 graphics acceleration.
The camera has a five-megapixel resolution. The N900 has 32GB of built-in memory, with the option of expanding that to 48GB using a micro-SD card.
The battery has a capacity of 1320 mAh. The device measures 110.9mm x 59.8mm x 18mm and weighs 181g.