Hi Tim ----

>>>Is it true that comboxes become too slow to use when its rowsource points to a file with many records in it?
>>
>>Yes, it's true. Also, it greatly slows down user's interaction.
>
>Ah ha, so should I do something like use a listbox instead and have a textbox adjacent for user input?

Thats what I do but I found it becomes a bit impractical for tables of 20,000 records or more (I think due to the speed that the listbox populates, not the query).