I can get completed forms to email

I am experiencing the same problem.

I am in process of updating some existing forms which we could previously email.  Since I have made the changes in a later verision of Adobe, the email functionality has been lost.

I am using Adobe Acrobat X Pro and they are on Adobe Reader XI

You can also setup the button to submit to a server-side script, such as ASP.net. The script bypasses client-side email software and sends the submission to your inbox. Works with Adobe Reader and most end-users. Adobe Reader for mobile has limited functionality.

Visit the following site for online examples:

www.pdfemail.net/examples/

A less secure and less reliable way to to set the submit button to point to an email address:

mailto:you[@]server.com

Note: This email method requires client's to correctly configure their client-side email software; and may not work with everyone.

Visit the following site for an online email script generator:

www.nk-inc.com/software/fdftoolkit.net/email-pdf-mailto-generator.aspx

This happens because they are using a very old version of Adobe Reader. If they upgrade to a newer version (as the error message says), then they would be able to save the completed file on their computer. Alternatively, you as the author of the form can allow them to do it even with their current version by applying the Extended Reader Rights to it (before sending it out). What version of Acrobat do you have?