Mail Merge email from another account Outlook 2010

What do you mean when you say "from another email address"?  Do you mean that you have more than one account in your Outlook profile and you want to be able to pick the one you send from?

I'm a little confused by the wording of your question.  Are you trying to send emails from an email address other than your own?  Or are you trying to do a mail merge using a contact list from a mailbox other than your own?  

If it's the second one, you need to have the rights to open the contacts folder from the other mailbox. Then once you have the contacts list available in Outlook, you need to go to the properties of the contacts list, click on the Outlook Address Book tab and make sure that Show this folder as an email address book is selected.  Once that's all in place, you should be able to see it when you select the recipients for your mail merge in Word.

What do you mean when you say "from another email address"?  Do you mean that you have more than one account in your Outlook profile and you want to be able to pick the one you send from?

Yes, I have order email address that I need to send mail merge emails to our clients. But I want to send from the order email address not from my email address.

I have only one profile setup in my outlook.

If it's the second one, you need to have the rights to open the contacts folder from the other mailbox. Then once you have the contacts list available in Outlook, you need to go to the properties of the contacts list, click on the Outlook Address Book tab and make sure that Show this folder as an email address book is selected.  Once that's all in place, you should be able to see it when you select the recipients for your mail merge in Word.

What if I create a new profile of order email address which uses for sending news letters to our clients, then I choose the order profile when opening outlook? when finish sending them then I switch to my own profile?

Thank you very much!