From the code you posted, it looks like you may have forgotten the package declaration in your module. You should add a
package NotesOLE; at the top of your module.
Curiously, although the missing package declaration would prevent perl from calling the module's import method, it should also cause all of the module's methods to be declared in package main in the first place. So, there may be something else going on to cause the Undefined subroutine &main::OpenNotes called ... error. Do you have another module which loads NotesOLE before test.pl does?
Anyway, put in the package declaration and see what happens.
