Importing users from external database into your forum

[Hitterman]

I wanted to ask that if i have to forum and i wanted to add all the users from my older forumm to my newer forum. Is it possible?
I mean i have a database with usertable of a vbulletin forum. Now i want to add these users in my current vbulletin forum,how can we do this without any userid change or password loss of current users.

[Dismounted]

ImpEx can do this, but all the user IDs will be renumbered.

[Hitterman]

Will only the newly added users id numbers will be changed or all will changed including those users who already exist on the forum.

[Dismounted]

Those who already exist will not be touched.

[Hitterman]

Thanks for the help.