We recently converted our InterBase 6.01 application to Firebird 2.0
Beta and kept a record of differences and their effect on our
conversion process.

Before we started, we searched for any migration guidance document on
the web and did not find any one summarizing document, so we decided
to keep a record and make it available to others who might want to
tread the same path.

If you are looking for InterBase to Firebird conversion you can find
our notes at
http://www.topicscape.com/InterBase_Firebird_migration/IB2FB.php

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