The following table outlines the approximate amount of flash memory used for each optional application on the BlackBerry smartphone.

Optional application	Approximate space required*	Approximate number of equivalent messages*
BlackBerry Attachment Service	120 KB	120 messages
Help	65 KB per installed language	65 messages per installed language
Instant Messenger applications	350-400 KB per application	350-400 KB per application
Language Support	100-120 KB + per language	100-120 KB + per language
BlackBerry® Maps	500-1000 KB	350 messages
MemoPad	10 KB	10 messages
Password Keeper	25 KB	25 messages
Tasks	25 KB	25 messages
Third-party applications	Variable	Variable

*The approximate space required for an optional application always depends on the model of the BlackBerry smartphone and the version of the BlackBerry Device Software that is installed.

Note: Removing unused languages in the Setup Wizard is one of the most effective ways you can increase the available flash memory.

If you're using a BlackBerry 8xxx series handheld, yourTotal Flash Memory is 62500 KB, according to RIM--unless you're using the recently released Curve 8330, which has 94500 KB of flash memory.

From:
http://mis-asia.com/final-import/cio/cio-article-485