I believe the limitations is 1024 characters. Use the shell Popup inatead, which has a higher limit

WshShell = CreateObject("WScript.Shell")
lcstr=REPLICATE('A',5000)
WshShell.Popup(lcstr,,"Very long string")

>Hi.
>Is there a way of increasing the messagbox message size. it seems to be limited to a certian no. of characters and just truncates the rest?
>
>Regards,
>Gerard