Outlook 14.3.9 on Mavericks

Hi

I have this very simple applescript that works on my 14.3.9 on OSX10.7.5

tell application "Microsoft Outlook"
    set newMessage to make new outgoing message with properties {subject:"Invoice2358.pdf", content:"Document attached"}
    tell newMessage
        make new attachment with properties {file:"Macintosh HD:Applications:Mac:Adnetv5:PDFs:Invoice2358.pdf"}
    end tell
    open newMessage
end tell

but on the same version of outlook on OSX10.9.2 i get the following error

error "Microsoft Outlook got an error: Can’t make class outgoing message." number -2710 from outgoing message to class

outgoing message still appears to be in the dictionary.  Anyone got any ideas?

Cheers

Keith