We tried to register the .dll file on a 32 bit Vista machine and got the following error message:
"The module "ChilkatMail2.dll" was loaded but the call
to DllRegisterServer failed with error code 0×80020009″
Try running regsvr32 as the administrator. Create a .bat file and insert the regsvr32 command to register the DLL. Then right-click on the .bat and select "Run as administrator".