The last day to schedule your U-M Box account migration is October 31, after which all Box accounts will be deactivated. Those who have not migrated their data by then will have a grace period until November 14 to select “Migrate Now” using the ITS Self-Service Migration tool. Once the grace period has ended, remaining Box data will be archived, which means all metadata — such as permission shares and creation dates — will cease to exist.
For more information, please see the "Closure of Box-to-Dropbox migration window quickly approaches" article in the Michigan IT News.