I have email validation MOD on my forum (3.3.05), before upgrading to the new version (3.4) will I have to unMOD my database? and does this apply to all MODed datbases?
no you don't have to unmod your db, the email validation is now encorporated into the base code, so it will just use your fileds if they are the same(most likely) or just add new ones if it needs them. Any other mods datafields will just be ignored by the update, so when you reinstall your mods, you will only need to update the code not the db
When 3.4 is released the setup file will remove the MEMBERS_PENDING table from your database and re-create it, to avoid any problems that might crop up if we just used the existing table.
As Huwr said, email validation is now part of the 3.4 version so you won't need to install it again.