upgrading from mysql 4.1.12 to mysql 5

i have a few questions about upgrading

1. why should i upgrade?
2. how do i upgrade?
3. how will this effect my existing mysql based apps, such as phpbb forums, mailserver and my other existing databases?

my server configuration:
Windows, Apache 2.0.54, PHP 4.3.11, mySQL 4.1.12, phpMyAdmin 2.6.2, Perl 5.8.6, ZendOptimizer 2.5.10, and hMailserver 4.0b125

 

 

 

 

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