Using the mail merge feature in iWork Pages is really useful if you have to send out mass mailings. It's really easy to do if you use the predefined templates, you can pull data from a Numbers spreadsheet or your Address Book.
How to do it:
1. Open Pages.
2. If it doesn't open automatically, Go to'File-> New from Template chooser'. Pick a sample letter or envelope, such as 'Green Grocery Letter'.
3. Go to 'Edit -> Mail Merge'.
4. Select a source, either Address Book or a Numbers document. I am choosing Address Book for this tip.If you've setup Groups in your address book, you can choose one of those. That's actually the more precise way to do it.
You have an option to send these direct to a printer or a new document. I like to look at these and make sure it went ok before I print, so I am choosing 'NEW DOCUMENT'
Now click on 'Merge'.
Now it will add the mail merge fields into your documents and put page breaks in between each one.
You can use this for any template with mail merge info, or you can create your own.