After Oct 20 it will not be possible to get new ClientLogin tokens - so using normal C2DM, with ClientLogin, will no longer work.
Please use the /migrate endpoint before Oct 20th to generate a new token. The token generated by /migrate will continue to work after Oct 20th, but in order to migrate you need
a valid ClientLogin token.
With the migrated token - you can still use the c2dm endpoint, as described in the migration document. register() with c2dm-style email address will also continue to work for old clients
that can't be upgraded to GCM project ID style.
Costin