I am new to the community and IPS. My old forum was use Nuke Evolution Extreme 2.07. I was just wondering if I could save and import. Basically migrate it over to the new database that IPD uses. Would all the User's and Forum threads be recovered like from a backup? Any help would be greatly appreciated.

It’s not directly supported: https://invisioncommunity.com/services/migrate

You might be able to convert it to phpBB and then to IPS 4.x. 

There is also a custom conversion service (see link above) but it’s not cheap. 

Thank You for the quick reply and suggestions. I will have a look at the options and make a decision.