I am not sure if Medisoft has an Import/Export utility builtin? If it is, follow the process that they describe.
Based on Lytec Software's process(I hope MS also has the same kind)....you have to export out a Patient records which will give you the data format they accept.
You just have to copy each column's data from AC Demographics file to MS Patient (demographics) file matching each column.
FYI.....Column headers will be definitely different from each programs..you just have to make sure which one's data makes sense to the other's.
If there is no import utility....then I feel for you the pain you can go through re-entering provided how many records you have to migrate. GOODLUCK!
HOB