Yet another question about private user areas

Hi all,

I just want o be sure that wordpress CANNOT do what i want, in order to try to find an alternative for myself…

I have begun coding this in asp,net mvc but i want to make one last try before i go full custom.

My needs

– Every user must have his own personal area including pages categories tags. I will have some common categories and tags in addition to the private ones.

Is there any solution apart from going to multisite?