I have created a form in Adobe Acrobat Pro with several form-fillable fields. All multi-line fields were created with the "long text scrolling" feature in Acrobat turned off, and all fields are locked. However, when I email the form using Thunderbird and open it in Thunderbird (versus save and open in Adobe), all of the multi-line fields now allow text scrolling. As an example, I want only 5 lines of text to be entered in a particular box on the form, and Acrobat Pro and Reader perform correctly and limit the number of lines to 5. But when I email the form and open it in Thunderbird, I can enter unlimited lines of text. As this form will be primarily emailed to recipients, I want to be sure the line limitation survives emailing. Is there a setting in Thunderbird I'm missing when sending, or opening the form? Thanks