/var/lib/squirrelmail/prefs/<userid>.abookThe files user and group are apache. ie:
cd /var/lib/squirrelmail/prefs chown apache.apache *Will set the permissions correctly.
Computer Tips - Where is the Squirrel Mail address book stored?
Date: 2012dec26
Product: SquirrelMail
OS: Linux
Q. Where is the Squirrel Mail address book stored?
A. On my machine its stored here: