I know this is a stupid question but I am hoping someone will answer it anyways.  I like creating my own items as they are very challenging.  The hair room does not give you enough control over your hair.  When I create it in go z and import it back into poser, the hair is going every which way, nothing like what it looked like in go z,  brender will not let you create strand hair for exportation.  Or I have not found a way yet.   I do not have the money to experiment with add ons to find one that is not to difficult to learn.  Tried making polygon hair, but it is much more difficult then it looks.  So I am wondering what program people use.  Too spend two weeks in the hair room does not seem productive. 

You can export hair from Blender3D if you go into geometry Nodes mode and add one node: Realise Instances to turn the procedural hair into geometry hair. It will be a lot of poygons, though.  Another way is to extract edges in Blender from the scalp base, which is the old method.  If you are creating anime-style characters, freeware Vroid Studio has easy hair creation which can be exported as OBJ.  

The hair room is extremely old tech that hasn't changed since Poser 5 or 6, if I remember correctly. It's been largely abandoned, including by creators, except very few. Personally, I hate it and just leave it there. 

Apparently, Bondware is looking into updating or changing the Hair Room for Poser 14, but so far that's only been a footnote in a Poser Software newsletter so far, so we don't know anything about it.

Personally, I create hair using Blender with a plugin called Hair Tool. You can find various methods of creating what we call hair cards (stripes of polygons with transparency maps to simulate hair strands) if you search for things like "game hair tutorial" or "realtime hair tutorial".

I don't think Poser's hair room hair was designed to be used with other programs. I do all my work in the hair room but it's not easy. My methods are tedious. One uses a python script that isn't compatible with Poser 13 without jumping through some hoops. I'm also not sure if it's available anymore. The other involves working with individual strands or very small groups and it's still hit or miss how it turns out. Hence why I haven't made any for a while.

Infinity10's method will create transmapped hair if you want that. I know some of the vendors in the Marketplace use Blender to make their hair. But I don't know if anyone has gotten strand-based hair from blender into Poser.

Fibermesh works fine in Poser. If you don't add a profile to it in zbrush then Poser will treat it as curves, they just can't be modified in the hair room (because they weren't created there). If you do add a profile in zbrush then Poser will treat it as geometry and can be transmapped. Both versions can have materials applied and be morphed.

There is a new add-on for blender.

https://www.youtube.com/watch?v=g_ZIOafq4QU