Can I share data between MacJournal and WinJournal?
MacJournal and WinJournal store data in different formats, so it is not currently possible to have both applications read directly from the same data file(s).
One simple way to share data between the two applications is to get a free blog account (you don't necessarily have to share it with anyone, and you can even password protect it with some blog services), and configure both MacJournal and WinJournal to publish entries to, and download entries from, that blog. For example, if you publish an entry to your blog with MacJournal, you can download that same entry from the blog into WinJournal. If you edit and update that entry in MacJournal, you can simply refresh the contents of that entry in WinJournal by clicking on "Update Entry from Blog".
If you are looking for a one time transfer of data between the two applications, you can Export the data from one and import it into the other. Please note that using this process may not preserve all of the formatting, background, attachments and links in the post.
With more and more users starting to use both WinJournal and MacJournal, we will be looking at simpler ways to share data between the two applications.