Apple

I think this is what you're missing. It doesn't do exactly what your script aims to do but only because I'm lazy :-) It shows the missing bits.

tell application "Microsoft Entourage"
set main_account to item 1 of every Exchange account
set theFolder to "Some Folder"

set theSelectedMessages to selection
repeat with aMessage in theSelectedMessages
move aMessage to theFolder in main_account
end repeat
end tell

Hope this helps

Steve
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http://www.stetho.co.uk