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Menneisyys:
I'm not 100% sure about it being RDP4 based...but it always looked that way to me. It never supported any RDP 5.1 specific features like Sound or even more than 8 bit color and does not really seem to behave any differently than the the WinCE 2.11 and 3.0 clients that are known to be straight ports of RDP4. If anything, it could be some kind of bastard child of RDP 4 and RDP5....but I doubt it. Or, it could be RDP5 based but without support for the RDP5.1 updates. (like sound)
Yup, it's 5.0 "only". However, the leap between 4.0 and 5.0 was considerable - 5.0 consumes far less bandwidth. 5.1 has "only" introduced sound transfer and high/true color modes, no additional bandwidth usage reduction.
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I would not really use the Mochasoft client as a good indicator of anything. I tried it a few times and its obviously not as good as any of the Microsoft versions. (Its quite slow and buggy) Its not really suprising that the MS client would work better. Its based on the official RDP sources while the Mochasoft author had to write his client from the ground up using publicly available documents.
Mocha is RDP4-only and has much worse bandwidth usage if you don't explicitly disable animation in the remote desktop machine
(I'll publish my benchmark results comparing these on 2-3 days
); I've directly confirmed this with its author.
Also see for example the following image for a comparison of RDP4 and 5's bandwidth usage:
(NT4 TSE used RDP4, while Win2000 TS used RDP 5.0
)
Now I understand he is talking about when the client has connected. (Isn't he?) 
