zarafa-admin: command not found

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-admin - from package: zarafa-utils

You may install the required package with command yum install {package}

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