I've worked in PC Quark for about 20 years and getting acquainted with InDesign. I work for an in-house graphics department and found that we will be bringing in a product manual from one of our subsidiaries that is in Interleaf. What are the conversion issues of Interleaf to InDesign?
A possible issue could be that you cannot open your Interleaf document with InDesign …
What sort of document is that? Can your program "Interleaf" save as something you can import into ID? (XML, various database formats, Excel, RTF, Word … plain text, if all else fails …)