Hi, just wanted to bump this post because I'm also interested in this.
There seems to be a robust way of exporting from MapMate to Recorder http://forums.nbn.org.uk/viewtopic.php?id=3958 by generating Recorder compatible 'MM' keys from the MapMate keys. Therefore, any duplicates or amended records that are included in subsequent MapMate exports Recorder imports can be recognized.
I can't find a similar solution for exporting from Recorder to MapMate, which would be useful for my regular data exchanges with one our Local Record Centres who use MapMate. Solutions like http://forums.nbn.org.uk/viewtopic.php?id=708 don't seem to take into account keys, and therefore seem to be a minefield for duplications. MapMate keys having shorter character lengths than Recorder's obviously doesn't help, but I'm sure with some agreed and consistent character mapping a solution could be arrived at...? Surely there is a need for this, perhaps I am missing a solution that's already out there?
Cheers,
Andy.