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If a native MIME message is accessed by an R4.x client, or replicated to an R4.x server, the R5 server converts the message to CD records on the fly. If the native MIME message contains inline images, the image conversion may fail, with the result that the images are converted to attachments that cannot be accessed by an R4.x client. When an R4.x client displays the message, attachment icons appear, but attempts to view, launch, or detach them result in the error "Invalid or nonexistent document".

The original native MIME message will still contain the images and can be successfully accessed using an R5 client or a Web browser.

This problem always happens if the R5 server is a UNIX server; on NT servers it happens rarely, if at all. The problem affects only inline images; image attachments are not affected.