I have done a few migrations from Accpac to Great Plains (would NOT recommend using the migration tool though). Since you are moving onto a much more flexible accounting package, I would first recommend looking at which type of reports you need, in order to restructure your chart of accounts (can report so much better in GP with a multiple segmented chart). From there, I would then export your GL trial balance, map to new chart and import into GP (you can get temporary reg keys for the use of master record imports). Then export out your customers/vendors, clean up data and import. Then export out your current outstanding receivables and payables, then import into GP. Now you are ready to go live with much cleaner setup than Accpac.