mapitest: 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/mapitest - from package: openchange-client

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

On Debian possible default full paths are:

/usr/bin/mapitest - from package: openchangeclient

You may install the required package with command apt-get install {package}

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