The Script opening in the editor is actually an innovation that was developed through Michael Henley, the current top dog in the points race for the Automator forum. I am sure he would be happy to let you have a copy if you send him an email.
I have been able to work out a solution to your problem that uses both Automator, as a front-end for gathering most of the information associated with the previous workflow using the Group Mailer action, and AppleScript to pick up the remaining information and generate the emails.
The Automator workflow consists of the following:
1) New Mail Message with subject, message and account being determined. Show Action When Run is also checked, Show Selected Items radio button selected, and Account, Message and Subject checked in the list;
2) Get Specified Finder Items with Show Action When Run checked;
3) Get Specified Address Book Items with Show Action When Run checked;
4) Run AppleScript
click here to
open this script in your editor
<pre style="font-family: 'Monaco', 'Courier New', Courier, monospace; overflow:auto; color: #222; background: #DDD; padding: 0.2em; font-size: 10px; width:400px">property GreetingWanted : true
property theGreeting : ""
property GreetingNameOrder : {"First and Last Name", "First Name Only", "Last and First Name", "Last Name Only"}
property theCompleteGreeting : ""
property theSubject : ""
property theContent : ""
property FileAttached : true
property theAttachment : ""
on run {input, parameters}
set theNumberOfInputItems to count of items in input
set CountOfAttachments to (count of items in input) - 2
-- Gather Contact Info
tell application "Address Book"
set theEmailGroup to last item of input
set FirstNames to first name of people of theEmailGroup
set LastNames to last name of people of theEmailGroup
set EmailAddresses to value of email 1 of people of theEmailGroup
end tell
-- Generate emails
tell application "Mail"
-- Email info
set theSubject to subject of first item of input
set theMessage to content of first item of input
set theAttachments to items 2 thru (CountOfAttachments + 1) of input
-- Greeting info
display dialog "Would you like to add a greeting?" buttons {"Yes", "No"} default button 1
if button returned of the result is equal to "Yes" then
set GreetingWanted to true
display dialog "Please enter the opening for the greeting." default answer "Dear "
set theGreeting to text returned of the result
set GreetingName to (choose from list GreetingNameOrder with prompt "Please select the choice of name for the greeting" default items item 1 of GreetingNameOrder) as text
else
set GreetingWanted to false
end if
repeat with i from 1 to count of EmailAddresses
if GreetingWanted then
if (GreetingName = item 1 of GreetingNameOrder) then set theCompleteGreeting to theGreeting & item i of FirstNames & space & item i of LastNames
if (GreetingName = item 2 of GreetingNameOrder) then set theCompleteGreeting to theGreeting & item i of FirstNames
if (GreetingName = item 3 of GreetingNameOrder) then set theCompleteGreeting to theGreeting & item i of LastNames & space & item i of FirstNames
if (GreetingName = item 4 of GreetingNameOrder) then set theCompleteGreeting to theGreeting & item i of LastNames
if GreetingName = false then set theCompleteGreeting to theGreeting
set theCompleteContent to theCompleteGreeting & "," & return & return & theMessage & return
end if
-- Generate email
set email to make new outgoing message with properties {subject:theSubject, content:theCompleteContent, visible:true}
tell email to make new to recipient with properties {address:item i of EmailAddresses}
display dialog "Would you like to add a file attachment(s)?" buttons {"Yes", "No"} default button 1
if button returned of the result is "Yes" then
-- Add attachments
my MoveToEndOfContent()
repeat with i from 1 to CountOfAttachments
tell email to make new attachment with properties {file name:item i of theAttachments}
end repeat
end if
end repeat
end tell
return input
end run
on MoveToEndOfContent()
tell application "System Events"
tell process "Mail"
keystroke "a" using command down
key code 124 -- right arrow
keystroke return
keystroke return
end tell
end tell
end MoveToEndOfContent
</pre>
PowerBook 12" Mac OS X (10.4.8) 
