Hmm Kelly,
I don't know much about MS Access, but fear it treats c/s databases as
if they were desktop databases. Probably it transfers entire tables
across the wire - a no-no in c/s methodology defeating most of the
benefit from using Interbase.

So, I'd recommend you to either go for Delphi against Interbase or
Microsoft Access against Microsoft Access (though this is like swapping
your car for a nice pair of running shoes) - I don't think mixing
IB/Access is very good.

My recommendation would be to use Firebird (a descendant of Interbase,
just without many of the bugs) together with IBObjects. There are a
couple of other decent tools to choose from as well, just don't use the
BDE (too buggy when used against c/s databases) or mix Firebird with IBX
since it may cause compatibility problems in the future. But it is just
a shot in the dark, you've told us nothing about the volume, complexity
or how many simultaneous users your database will have.

HTH,
Set