http://eqemulator.org/forums/showthread.php?p=164157
Alter the 'mailkey' column in the character_ table to have a default value of 0, or try installing an earlier version of MySQL (5.1 ?).
Altering the mailkey column should get rid of 'error #1364 Field 'mailkey' doesn't have have a default value', however there may be other incompatibilities in MySQL 5.5 that are causing other issues.