You certainly can have mixed page layouts in a single PDF, and good Saint rob_au provided a working demonstration here.

Update: I have actually tested this script by merging one PDF containing all portrait pages, and another containing all landscape pages, and it displayed exactly as desired (using Acrobat 5.1.0 under Win2k). Perhaps there is something odd about your original PDFs?

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I'd like to be able to assign to an luser

In reply to Re: Problems merging PDFs by Albannach
in thread Problems merging PDFs by Anonymous Monk

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