zarafa-passwd: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/bin/zarafa-passwd - from package: zarafa-utils

You may install the required package with command yum install {package}
Error in other languages:
zarafa-passwd: bevel nie gevind nie
zarafa-passwd: comandă negăsită
zarafa-passwd: comando não encontrado
zarafa-passwd: commande introuvable
zarafa-passwd: command not found
zarafa-passwd: käsku ei ole
zarafa-passwd: không tìm thấy lệnh
zarafa-passwd: komanda nerasta
zarafa-passwd: Kommando nicht gefunden.
zarafa-passwd: kommandot finns inte
zarafa-passwd: komut yok
zarafa-passwd: nie znaleziono polecenia
zarafa-passwd: níor aimsíodh an t-ordú
zarafa-passwd: no se encontró la orden
zarafa-passwd: no s'ha trobat l'ordre
zarafa-passwd: opdracht niet gevonden
zarafa-passwd: parancs nem található
zarafa-passwd: perintah tidak ditemukan
zarafa-passwd: príkaz nenájdený
zarafa-passwd: příkaz nenalezen
zarafa-passwd: команда не найдена
zarafa-passwd: командата не е открита
zarafa-passwd: 命令找不到
zarafa-passwd: コマンドが見つかりません