The same statement gives the Microsoft recommendations as "The business rules
may have to be built from scratch on the BizTalk 2013 environment."
Given that you can create your own fact retrievers which would have been .Net 2.0 code or your own vocabularies using static support which would have been again .Net 2.0 code, you'd be required to rebuild that and maybe change the version numbers in which
case the import would reference the earlier unsupported versions so not work.
Given the scope of the migration you would eventually have to setup a pilot environment and then assess the methodologies for yourself given the extensibility of the BizTalk Framework such as custom components, functoids, fact retrievers, helper libraries,
etc., etc.
Regards.
- Marked as answer by
TarunGarg AKG
Monday, April 21, 2014 12:25 PM