Adding Instrument with MIDI output

Here in the docs for X2 I can find it: https://www.cakewalk.com/Documentation?product=SONAR%20X2&language=4&help=SoftSynths.19.html
 
In the current version I don't seem to have the option "MIDI output". How is it done?

Well I found it. You need to use "Insert Softsynth" from the menu bar, not the big [+] button. There is an option "Midi output".
After that it's a bit counter-intuitive. You don't choose a MIDI output on the track you just created, instead you have to choose a MIDI input on the track where you want the MIDI to go. Among the input selection list you can find the output of the previous track.

Thanks, but that wasn't exactly what I wanted to do. I needed an instrument track with a VSTi that additionally outputs it's MIDI to another track. The way I described seems the only option. On second thought it also makes kinda sense that way, you can make serial and multiple parallel routes that way. Still a bit counter-intuitive.

Zargg
Hi. If I understand correctly what you are after, this is now located in the Vst drop down menu in the instrument itself.

Hope it helps.
All the best.

Yeah that's exactly it. But all instruments I checked this is greyed out, like in your screenshot. Do you maybe know how to access it? Would be an easier way than having to re-create each instrument where I need it.

occide
I needed an instrument track with a VSTi that additionally outputs it's MIDI to another track.

This will only happen if the VSTi supports it. Moreover, starting with X3, "Enable MIDI Output" by default is enabled for synth that support it. Adding an instrument track using the Add Track button does this automatically like all the other synth add options. This is one reason referring to old documentation is not a good idea. FWIW, removing the old version from the URL does resolve to the current page albeit not in English. I have to change the language to 3 in the URL to display the English page.
 
It might be a good idea to provide more detail about what the desired result is. I suspect this will be a case of cloning the MIDI data or using a virtual MIDI cable to drive multiple synths. But this is just a guess because the OP has not clearly stated what purpose of the exercise is.

Could someone post a known working example of using Midi Output - preferably using Cakewalk plugins.  I'd like to recreate it.  For instance, I thought I could send a pattern playing in Session Drummer to Addictive Drums but it's not working.

MIDI Out can be enabled even for synths that don't support it. Session Drummer does not send MIDI Out, and I don't know of any SONAR-bundled synths that do.
 
One oddity to be aware of with MIDI-generating plugins: I believe it's still the case that in order for MIDI Out to be active, you have to to have an audio track with input assigned to an audio ouput of the plugin even if you're not using it.