The Nokia N800 was introduced in early 2007 as a replacement for the Nokia 770. It had a much faster processor, double the amount of RAM, and many other significant improvements such as a built-in camera for video calls, built-in stereo speakers, two SD-sized memory card slots and a built-in stand. It also had what many people considered to be a more attractive curvy steel-and-plastic casing. To put the icing on the cake, Nokia took the internet tablet range within its Nseries sub-brand, usually reserved for its high end expensive smartphones.
The N800 also had a new operating system, Internet Tablet OS 2007, which replaced the 770's OS 2006. There was no version of OS 2007 available for the 770, and software written for the 770 would not work on the N800. 770 owners, many of whom had only just bought their tablets in late 2006, felt abandoned by Nokia as the support for their tablet disappeared.
In late 2007, Nokia announced the N810, which was nominally the replacement for the N800. It too would have a new operating system, OS 2008, and featured a built-in keyboard and built-in GPS satellite navigation receiver. However, Nokia seemed to learn its lesson from the 770 fiasco, and the N810 wasn't really a replacement for the N800 but more of an alternative model. The N810's processor and memory is identical to that of the N800, and OS 2008 was made available as a free upgrade for the N800. An N800 running OS 2008 is technically identical to the N810, running exactly the same programs at exactly the same speed. The N800 even has some of its own hardware advantages to counter the N810's keyboard and GPS: the N800 has two memory card slots as opposed to the N810's one, and the N800 has a built-in FM radio receiver which the N810 does not have.
In truth, the N800 and N810 are the same tablet in computing terms, they just have different casings and different external hardware features. If you've bought an N800 it will receive support for just as long as the N810, because underneath their skin they are the same device.
Name: Nokia N800 Internet Tablet
Year of Launch: Early 2007
Battery Life: 3.5 hours browsing, 13 days standby
Wireless: Internet access through Wi-Fi (802.11b/g), internet access through Bluetooth-compatible mobile phones supporting DUN profile
Screen: 800x480 pixels, 65 thousand colours
Camera: 352x288 pixels in video mode
Storage Memory: 256 megabytes built-in, two SDHC memory card slots officially support cards up to 8 gigabytes each, unofficially up to 16 gigabytes each. SDHC slot compatible with SD, miniSD, microSD, MMC and RS-MMC card sizes.
RAM: 128 megabytes
Processor Speed: 400mhz when running OS 2008 (330mhz when running OS 2007)
Software Compatibility: OS 2007 or OS 2008 (depending on which firmware version is installed)