Do you wish to re-generate the Holidays list ?
This message occurs when closing the Holidays Manager, if Q++ notices that the holidays table has not been re-generated since the last change in holidays rules. Note that these changes to the holidays rules do not necessarily come from you; other users may have modified holidays rules while you were in the Holidays Manager.
If you say NO, you will later be prompted by a design-time message to re-generate holidays. Holidays generation takes about 20 seconds, depending on the number of rules.