they may be unique ID#'s, but a simple script can be made to identify all the ID's, and then replace them with new ones without changing anything else, or impacting the rest of the records. considering these guys live in databases, i find it puzzling they're making it out like it's a big thing that needs manpower to do. where i used to work, we had the same issue, and on a much larger scale, and we managed to take care of it in about 2 hours if you inlcude the time it took to write the DB script to fix it....So I went and asked if I could get into these details, but it is happening to all Ikariam communities AND they will all share one board. Some of you know how databases work, but others may not and basically each board user has a unique ID #. The problem is that ID# is the same on all boards (but different users). Basically - the board will not know how to put two different users with the same ID# onto the new board. There isn't a tool made, or people with any time to make them, to reassign those ID#'s so that they are unique for all Ikariam boards.
I am sure that there are ways to get that sorted, out but the decision was made to use the tools at hand and not tinkering with any kind of scripts - which means in the case of Ikariam, alongside many other communities that experienced the same fate, scrapping the existing board and starting a completely new one.