scalixadmin: 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/scalixadmin - from package: kdepim

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