A couple of months ago, I entered a ticket concerning being able to see that a folder in an OST had subfolders, but not actually access those subfolders. That ticket generated issue EMAILNET-34817, which was then resolved in the Aspose.Email for .NET 5.5.0 release.
After installing that version of the ibrary, I can now see the folders under the “Finder” folder, and access their contents.
However, I am still finding that there are individual items in both PSTs and OSTs that cannot be retrieved using Aspose, but can be retrieved using another product (IndependentSoft). These items have MessageClass values such as ‘IPM.Microsoft.FolderDesign.NamedView’, ‘IPM.Configuration.Calendar’ and ‘IPM.Microsoft.WunderBar.Link’.
I have attached both an OST and PST (saved as zip files) that demonstrate the differences between what the two products find, as well as Excel spreadsheets listing the differences. I have also attached a text file with a simplified version of the code I used to walk the PST/OST using Aspose and IndependentSoft