The ROI and operational improvements you can gain significant from migration to a SQL Server platform because managing large diversity of database platforms can become quite costly to a business; particularly when each architecture required its own database specialist that is capable of supporting the environment. But at the same time the effort and complexity of an SQL database migration is quit complex task for any IT group to undertake. Most organizations internal teams are not well equiped with the resources and most DBA lack of expertise.
The process of moving databases to SQL Server does required some prepration however. Microsoft offers a number of migration assistants specifically designed to facilitate SQL migration any other RDBMS databases. These assistants allow for a DBA to more effectively assess the scope of work required in order to undertake.
Best-practices, planning, architectural knowledge, and proven methodologies for post-migration optimization is critical for success. Bypassing or anything less can cause busness interruptions and lenthy delays.