There were some bugs in my N73, so I decided to update it's firmware.
Firstly I was surprised that I could do it myself. But the major surprise came a little later.
I used the backup option on the phone to store 'something' into my memorycard. Then I updated the firmware and restored the data from the card..
..Everything was back. And I mean EVERYTHING including all the 3rd party applications. Only things that didn't survive were the theme, the order of the icons and a text message which I opened just before the phone went black.
This has been a problem in Windows for -god knows- how many years. And then suddenly Nokia pulls it of! -And I know it can be a lot trickier on PC, but anyway. Thanks guys! ;)