Hello Maplers,Source: http://forums.maplestory.nexon.net/discussion/3594/maple-memo-global-migration-update/p1
Please make sure to accept both the service migration and the MapleStory game migration in order to begin playing on November 10th. If you miss your chance now or wait until after November 9th to migrate, you'll have to wait for an upcoming maintenance in order to access the MapleStory world in Europe.
6 What happens if my game has been migrated to the Nexon Launcher and I didn't create a Nexon Global Account in time?Source: http://maplestory.nexon.net/micro-site/ems
Once your game has migrated to the Nexon Launcher, you will receive a notification upon logging into the Nexon Europe Launcher. You will still be able to set up your Nexon Global Account and upgrade the Nexon Europe Launcher to the new Nexon Launcher but will not be able to play on the Europe server until your Maplestory Europe gameplay data has been transferred. The Maplestory Europe gameplay data will be transferred periodically after November 9, 2016. You will however be able to play on the North America server in the meantime.