After December 24th, 2012 you won’t be able to use 4Sync with your 4shared account, but all your files will remain at 4shared. We are encouraging all current 4shared users to create a new 4Sync account and transfer all their files to this account.
After December 24th, 2012 you can create a new 4Sync account with the same email as you use at 4shared. Alternatively 4shared Desktop application may be used to manage your files at 4shared.
If you forgot which service you registered at, here’s a reminder: Which user am I.