Be prepared for a lot - and I mean a LOT - of manual work. The forms should
come over fairly well, especially if you are using Visual Studio 2003 and
not 2002. ActiveX control widgets should be OK in most cases, and COM DLLs
normally work well. There can be some issues with COM DLLs but it is not
usually a problem.

However, you will have a lot of work with your code. One of the big issues
is printing - if you do printing using the Printer object, the code does not
transfer to a new format at all - instead the upgrade wizard flags it, and
you would have to figure out the migration of that yourself. Code that uses
the type "Any" to handle ByRef structs in API calls will not migrate
automatically. ADO code migrates quite well. Fixed length strings will be an
issue.

The details are here:

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vbcon/html/vbur
fMigrationWizard.asp