exch5.5 on nt4 mta error

I’ve successfully installed exch 5.5 with sp3 on winnt 4 sp6 on my test bench. Now I want to create a new TCP/IP mta stack but I don’t have that option. I can only see RAS mta stack when I go to click File, New Other, MTA transport stack. I installed the enterprise version of exch 5.5
Help pls..
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