But its an extra preventative measure and prevents those moments when recipients send a reply to everybody accidentally.

FAQ

Why dont I see a Design a Form… option under my Developer tab?

You will have to add it to your Ribbon using these steps.

Outlook 2010 enable developer ribbon

The option should then be added to the Developer tab.

Why is my Design a Form option grayed out?

I have seen this problem and Im not sure why it happens.

Outlook 2010 design a form button

Will this disable Reply All for non-Outlook users?

It depends on the email client.

Some do not support it, like Yahoo Mail.

Outlook 2010 message form option

Gmail does support it though.

Outlook 2010 form actions tab and properties

Outlook 2010 reply to all form action properties

Outlook 2010 reply to all send form definition with item

Outlook 2010 publish form as

Outlook 2010 publish form name

Outlook 2010 using the form

Outlook 2010 enable developer ribbon

Outlook 2010 design a form button

Outlook 2010 message form option

Outlook 2010 form actions tab and properties

Outlook 2010 reply to all form action properties

Outlook 2010 reply to all send form definition with item

Outlook 2010 publish form as

Outlook 2010 publish form name

Outlook 2010 using the form