ObjectStore vs. SQL server

My C++ server code currently uses ObjectStore 4.0. When thinking further into the future I have to decide which type of database to use - 1) Upgrading my code to ObjectStore 6.0. (Still using DDE for

   client-server(DB) tranactions)
2) Removing ObjectStore from my code and using SQL server instead. (Separating the DB from the server)

There are advantages and disadvanges for both. One of the major disadvantage of ObjectStore is the uncertainty of its support in the future versus SQL server.

Two of the disadvantages in removing ObjectStore and replacing it by SQL server are the amount of work to do this replacement and the question of performance (For example,ObjectStore offers automatic links for online update of data on the UI).

I would appreciate comments about which database to choose.

I would also appreciate suggestions of other ODBMSs like ObjectStore, that in more confidence may have support for the years to come.

Thanks,
Anat

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