Thank you for contacting the Telerik support team. We are constantly trying to meet our clients' expectations, so it is a pleasure to know that you found this new functionality useful!
The new feature is included in Migration module release with Sitefinity 5.1 3200 and above. The original 3.7 urls of pages will be migrated the same way they exist in your old 3.7 site.There is a difference between the format of content items urls in Sitefinity 3.7 and 5.*. So for news, events and blogs posts there are two options - the original url could be migrated the same way or the original url could be migrated as an additional url which redirects to the new 5.* url. To choose which way you would like to migrate news, events and blog posts urls, go to Administration > Settings and switch to Advanced settings, then go to MigrationModule section. You will see a property named "OriginalUrlsAreMigratedAsAdditional". It is set to False by default.
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