I have an old contact programme Lotus Organizer for Windows is there a way I can convert it to a Libre Office File?
If you still have the program Lotus Organizer or Lotus Smartsuite then you can export/convert from it your contact list to a text file which is actually a CSV file. This you can read with Calc and/or Base.
No old program you are out of luck because the .OR5 file contains calendar, todo, contacts and some more.
Some websites still sell the good old Smartsuite for around $20-$30.