If you are upgrading you will loose all your file edits, and you can't be sure that all your hacks exist for 3.0.7.
To start clean, it is the best to use ImpEx, since it will import all standard vB data, dropping all hack information. Be sure to read the stickied notes in the Import System forum at vb.com before you start, and do some test runs.
If your hacks didn't modify standard vb columns, the upgrade should be functioning normal, but again i suggest you test.
vBulletin.com is still teh place where you can get an official answer to these questions.
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