You can export the characters you made in Max and turn them into Poser characters. You'd have to rebone the characters though, Poser can only import .OBJ and .3DS (and the latter importer is yucky. .OBJ is Poser's native geometry format).
The morphs you made for expression and such also have to be exported one by one and imported into Poser.

You don't want to use Poser for rendering animations. Far too slow, and if you fill a scene with a nice environment, also far too crash-prone. Vue is a much better renderer when it comes to hi poly scenes (my Athlon64 4400x2 / 4 GB RAM rendered over 10 billion polys without a sweat in Vue 6 Infinite).

There are some gotchas. What parts of a Poser scene can be imported into Vue is dependent on the Vue version. For animations you'll want to use dynamic cloth, and probably dynamic hair - keyframing cloth and hair movement is quite time consuming. Vue 6 d'Esprit needs a plugin to import dynamic cloth and hair.

The animation tools in Poser are rather primitive compared to Max. So while you won't have to model, rig, clothe and texture a character like you have to do in Max, you will have to spend much more time in animating. On the other hand, if you can export BVH motion files from Max, those import in Poser pretty well. There are a couple of PoserPython scripts around that can help you clean up an imported BVH animation.

The pen is mightier than the sword. But if you literally want to have some impact, use a typewriter

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