How Percent of My Blog Content Can Be Moved By BlogML?

The answer varies based on your source and destination blogging engine and their features and also your use of these features. We try to support all common features of blogging tools in BlogML and also provide extensibility points to include other features as well.

This percent depends on the power of your BlogML tool and features of the destination blogging engine. If they support all features of your source blogging tool then you should be able to move all your content to new engine successfully otherwise you may loose a part of your data.

Generally, BlogML is designed in a way that it can help you move all your content. Limitations come from BlogML tools and blogging engines.