In the function/method call parameters are passed by value (unless it changed by SET UDFPARMS which I strongly discourage). You have to prefix parameter with '@' to pass it by reference. An array can be passed in only by reference. A property array cannot be passed by reference.

    * Copy the property array to a local array so it can be passed by reference
    ACOPY(This.aFiles, laFiles)
   .oOutLook.SendOutlookMail(lcTo, lcSubject, cPath, @laFiles)

>
>Until now i pass the array between forms, i need to pass the same array to an object like,
>

>   .oOutLook.SendOutlookMail(lcTo, lcSubject, cPath, .aFiles)
>

>If i use the same technique, in .SendOutlookMail it gives that 'taFiles is not an array'.
>

>SendOutlookMail
>   LPARAMETERS tcTo, tcSubject, tcPath, taFiles
>   DIMENSION This.aFiles[1]
>   ACOPY(taFiles, This.aFiles) && Error here
>

>
>João Batista