When you try to generate Printed Documentation output for a project in RoboHelp, where the .css file contains the property mso-bookmark, you see the following error message:
mso-bookmark is defined as one of the prefixed style properties in Microsoft Word to mark an anchor while saving the page as a Web document.
In a RoboHelp project, choose Printed Documentation as an output (SSL) and assign a .css file (containing mso-bookmark property) to the project. Try to generate the output choosing either PDF or .doc or both as output format. RoboHelp fails to generate the output, and the above error message is displayed. Typically Adobe RoboHelp 12.0.2 or later versions are affected with this issue.