This update was done a few months back, our apologies for the delayed post, we promise to keep more on top of this in 2009. We also encourage you to get involved in making EnterpriseMailer better, please feel free to send us your suggestions, or post them in the EnterpriseMailer suggestions forum for all to see!
In case you haven't uploaded a new list in a while, we have made this process much more simple now!
1) To access the new list upload tool, first go to the Subscribers & Lists section.

2) Choose the Address Book (In this example, MyAddressBook) in which you wish to upload your new contacts.

3) Click Upload from the tools now shown to the right.

4) Select the file you wish to upload. You can upload a simple text file (with one column of data), a multi-column CSV file (comma-separated value), or an Excel spreadsheet file in Excel 97 - 2003 format. After you have selected your file, click the Next (Preview Data) button.

4a) A small side note here for those users uploading Excel files. If your file has multiple worksheets which contain data, you will be prompted to choose which worksheet you would like to upload data from.

5) The next screen is a preview of the first 10 entries in the file you wish to upload.
Single Column Files If you are uploading a file with a single column of data, EnterpriseMailer assumes you will only be uploading email addresses and automatically inputs all valid email address in to the Email Address field of your Address Book/List. If you are happy with way everything looks at this point, click Next (Select Lists).

Multi-Column Files If you are uploading a file with multiple columns of data, you will really love this screen. Many of us use a CRM or database containing more than just the email addresses of a contact. You may have a file with the user's first and last name, job title, etc... You can upload all this information to EnterpriseMailer on this screen.
Lets take the following Excel file example below. Notice each of the 5 headers in the file: First Name, Last Name, Email Address, and Phone

When the data preview is generated you will see these fields from your file reflected in the columns of the preview page. Notice the drop down menus on top of each column shown in the preview. These menus are used to map each field in your file (IE - Excel or CSV) to a field inside your EnterpriseMailer address book. By default, the only field in an EnterpriseMailer Address Book is Email Address. In order to upload the other fields in to EnterpriseMailer we must first create them so they can be selected from the drop down menus above each column. These fields are known as merge fields.

To create a custom merge field, simply click on the Click here if you need to add a new Address Book Field link above the preview.

Enter the new field name in to the text box and click Add Field.

Once you have added each of the fields you would like to upload, match the drop downs to the appropriate columns in the preview and click the Next (Select Lists) button.
6) On the select lists screen you can choose the lists which you would like to upload your contacts to and/or choose to create a new list by checking the new list box and entering the name for the new list.

You will notice the link Click here to show advanced options below the list selection menu. Checking this option before you upload your contacts will prevent email addresses which already exist in any other list from being uploaded to any new/existing lists. To help understand this, take the example above. We are creating a new list called New List Name and we have an existing list My First List. Let's say we have the contact john@email.com in My First List and our upload file (xls_upload.xls). If we selected this option using this example, john@email.com would not be uploaded in to New List Name, because it already exists in My First List.