>Of course, but most of them. If I want to change db layer to for example
>IBO, I think that I have change all database components (grids, combos
>etc). It's big work in the middle of supporting clients with current
>version. But of course we think about this. Do You suggest to change it as
>soos as is possible?

Krzysztof,
luckily you are very wrong about IBO. It has two different strands of
components - tDataset compatible and native components. The change you seem
to expect only applies to native components, tDataset components could
replace the BDE very quickly (I think Jason boasted about replacing the BDE
in one of the sample applications in less than a second!). A complicated
application like yours would of course take some time to convert, but Jason
has made an effort to make changing from the BDE as painless as possible
and it shouldn't take you long to get your program up and running (there
may be some niggles to brush up afterwards).

Switching to native components could also be a good idea, but that is far
more complicated and something you can do at a later stage when you have
time for it.

HTH,
Set