Re: saving to version 6 from version 7, (not version 6.1)

There is not a direct way of saving back 2 versions. LabVIEW only supports saving a single version back, ie 7.0 to 6.1. I believe the conversion kit that was mentioned refers to the ability to open old versions, 3.1, in newer versions of LabVIEW. The only way that you can save a VI from 7.0 to 6

Re: saving to version 6 from version 7, (not version 6.1)

Not that I know of, unless NI has some backdoor to do so it isn't possible. You can always save to 6.1 and then to 6.0. Sorry.