We are aware that support for such scenarios is critical and we are closely working with the RichTextBox team to allow integration between RadBook and RadRichTextBox.
The RichTextBox team have plans by the end of this quarter Q3 2010 to have WPF version of the RichTextBox. Therefore, by the end of Q3 2010 you will be able to load DOCX files in RichTextBox, integrate the RichTextBox with Book, search the text etc.
As for PDF, the short term plans are to have only export.
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