As we transition to the new Hyland Community, some post links may be temporarily disrupted as we finalize redirects. We apologize for the inconvenience and are working to resolve this as quickly as possible. Details.
When I use Alfresco 3.4d with Mysql, it is hard to migrate my data and configuration to Alfreco 4.0 postgresp next year??
No - it will be the next community version. It needs features in advance of 4.0.