1. is there any specific reason why my email button doesnt work , does it need an email address? <br /><br /><answer> Yes it needs an email address. Does your PC have an email client?<br /><br />2. if a user sends a file as an attachment can the second, third user etc then open, ammend the form and send it on its way to someone else. <br /><br /><answer> Yes ...I assume that by sending it on its way they would do that via email as well.<br /><br />3. will i be limited to 500 users or less <br /><br /><answer> In the license agreement, the Reader Extensions that ships with Acrobat only allows you to distribute to 500 users; otherwise, you will need LiveCycle Reader Extensions where there is no limitations on usage.