Apache upgrade

My server is going to be upgraded 1.3 to 2.2 soon - I'm reading tons of stuff but thought it prudent asking here: what should I be afraid of (lol) and what should I re-edit after the upgrade? I know about gzip/mod_deflate thing but are there other things I should know about?

Is there anything I should worry about, for example in mod_rewrite rules?

1.3?  Geeze, that's old.  What version of Dolphin are you on?  If it's 6.1 -> 7.1, things should keep working, as long as the required modules are loaded.  I'm assuming the .htaccess file has been left to its defaults.

Edit: Moved.

Oldies but goldies not fashionable anymore? :)

7.0.X and did you mean Boonex or Apache's by required modules? :)

Not sure what is a default look of the htaccess but the rewrite rules haven't been touched, the only additions are changes in IfModule mod_php5 of course and added mod_expires, mod_headers and mod_gzip rules. I know I'll have to replace gzip with deflate after the upgrade. I'm just trying to collect all the relevant info - and toilet paper! - before (if) the zombie apocalypse hits my neighbourhood (server). Lol.