Users who have bought Nokia's flagship smartphone, the Maemo-based N900, won't be able to upgrade the device to MeeGo, Nokia said in a blog post. The MeeGo OS, merges Intel's Moblin and Nokia's Maemo Linux-based operating systems.

Nokia N900 runs on the new Maemo 5 Linux open source software. The N900 lets users open multiple application windows and run simultaneously while taking advantage of its cellular features. The N900 offers a high-res WVGA touch screen, QWERTY keyboard and a Mozilla powered browser.

MeeGo 1.1 will be available soon for the Nokia N900 smartphone, which will be able to boot into either the MeeGo or Maemo flavors of Linux. Meanwhile, Aava Mobile, which is porting MeeGo to its Intel Atom N6xx based Aava Mobile smartphone reference design, joined MeeGo's overseer, the Linux Foundation.

Nokia this morning reversed its seeming stance on excluding carrier customization from Maemo-based smartphones like the N900.

The N900 will be Nokia's first and last Maemo 5 smartphone, with the next version due to run the new MeeGo Linux mobile OS created as a joint venture between Nokia and Intel.

The Linux Foundation has announced MeeGo, a merger of Intel's Moblin and Nokia's Maemo projects as a single project under the leadership of the Foundation. The news came in a posting by Linux Foundation's CEO Jim Zemlin who called MeeGo "a next generation mobile operating system designed for the next generation of mobile devices".

Intel and Nokia are merging their open source Linux operating systems to create a MeeGo OS, designed for mobile devices ranging from handhelds to netbooks. Hosted by the Linux Foundation, MeeGo builds upon the core from the Intel-backed Moblin technology and adds Nokia's Maemo middleware elements, as well as Nokia's Qt application framework.

Symbian is the famous operating system that power up most Nokia mobile handsets. This OS was originally developed by Symbian Ltd. but then Nokia claimed it, next to an independent non-profit organization called Symbian Foundation, and implemented it on its devices.

I love Maemo. I’m not even going to try to deny it. It is, by far, my favorite mobile device OS. It is fast, flexible and highly customizable. It makes the Nokia Internet Tablets (N900, N810, etc.) a dream to use for nerds everywhere. (In fact, I have such a high opinion of Maemo, I included the ability to build applications for it in my visual development tool Illumination.)