4Gal - thanks so much for your response.

I always loved the idea of not migrating the attachments. However, if I am understanding suggestion #2, the users that only have access to QB Online would not have access to the attachments we leave behind with QB Desktop.  Our attachments have become more operational than historical, and we find ourselves needing access to some that are decades old but not knowing in advance which ones.  Which puts us back to needing to migrate them all. 

With respect to suggestion #1, if you know of a 3rd party service, other than Fourlane, that could help us with migrating our attachments to QBO, please let me know!

Thanks,

Keith