Ok it's Acrobat 6 and above... frustrating.
Because I can export to Acrobat 4.0 and then open that in Acrobat and set it to two up continuous cover page and it saves it that way.
Probably the feature is not in Acrobat 4.0 or 5.0... anyway it's fine I have it now.
Thanks for the quick solution.
anyone able to help me.. using CC and could do it previously on 5.5 but not now have tried everything... exporting interactive, normal pdf and also with different page option exports and nothing works. Have tried to change in properties in the pdf itself but even after quit and re opening file it is a single page document.. help!