Hi,
From the description, you want to deploy the automatic reply settings for all users in the environment, correct? Since the Automatic Reply settings are controlled by the server side, we may consider to change the settings from server side. See:
http://blogs.technet.com/b/exchange/archive/2011/09/08/configure-automatic-replies-for-a-user-in-exchange-2010.aspx
Since this forum is for general questions and feedback related to Office client side issue, I'd recommend you post a new question in the following forum to get further assistance:
http://community.office365.com/en-us/f/158.aspx
The reason why we recommend posting appropriately is you will get the most qualified pool of respondents, and other partners who read the forums regularly can either share their knowledge or learn from your interaction with us. Thank you for your understanding.
Steve Fan
TechNet Community Support