Implement import of PDF to RadFlowDocument, using PdfFormatProvider. This would require text recognition (including determining where paragraphs end as opposed to new line inserted because of the layout) and table recognition.

This will allow conversion of PDF documents to docx, RTF and HTML.

HtmlFormatProvider does not format super- and subscript content size on export

When an HTML document is exported with IndentDocument, there are unwanted whitespaces in the content.

Converting from Docx to Pdf images rotation doesn't stay the same.

Add support for mirror margins. Add support for the "2 Pages per sheet" and "Bok fold" settings as well. 

The .bin extension represents a binary file format which can contain images as well. When a document containing such an image is imported and exported using WordsProcessing, the image is lost and the default 'no-image' placeholder is used in its place.

The custom document properties enable the users to define their own properties to the document or use one of the predefined. 

In most of the cases, the document variables can be used instead. More information about them you can find at http://docs.telerik.com/devtools/document-processing/libraries/radwordsprocessing/concepts/fields/document-variables

Add support for the basicThinLines border style

Add support for import and export of floating tables.

Importing document with ShapeLocks leads to InvalidCastException:

Unable to cast object of type 'Telerik.Windows.Documents.DrawingML.ShapeLocks' to type 'Telerik.Windows.Documents.DrawingML.ConnectionShapeLocks'.'

When the table width is for example 22.7% it is rounded to 22% on import.

NullReferenceException cloning Table element into RadFlowDocument. The document contains some bookmarks as well. 

Shapes are currently skipped when exporting document content to HTML. Add logic to preserve them.

When a document containing a hyperlink before bookmark and it is exported to PDF or UpdateField(s) method is called an exception is thrown: "System.InvalidCastException: 'Unable to cast object of type 'Telerik.Windows.Documents.Fixed.Model.Editing.Layout.HyperlinkEndLayoutElement' to type 'Telerik.Windows.Documents.Fixed.Model.Editing.Layout.TextFragmentLayoutElement'.'"

The SecurityProtocolType is not properly set and leads to the exception.

Add support for importing shapes from RTF

Add support for the background tag: html - CSS color vs. background-color vs. background? - Stack Overflow

The background property might contain an actual image (it is not locked to color values).

When exporting, an option of how to create the PDF bookmarks should be provided:
- Using the RadFlowDocument bookmarks
- Using document Headings

Office Open XML defines a mechanism for the storage of content which is not defined by this Office Open XML Standard, for example extensions developed by future software applications.

The stored data could be an image.

Exception when there are merge fields in the header/footer and one performs mail merge: 

Unable to cast object of type 'Telerik.Windows.Documents.Flow.Model.Header' to type 'Telerik.Windows.Documents.Flow.Model.BlockBase