Nokia freeing up C:
Changed: Friday 21 September 2012
It seems to be a common problems with Nokia smartphones with Symbian S60: Gradually the system partitions fills up with in the end even the phone not working anymore.
The system partition (C:) is 65MB and in the end only 7MB was left.
It advises to remove all messages, but this didn't really help. Then, according to some tip I removed the email accounts in Nokia email, which resulted in a mere 10MB free space.
Then I removed the email app entirely and also Nokia Maps. This made 45MB of space free.