Trying to connect to both mac and windows on one drobo

Hello all. I’m repurposing a first generation Drobo as a place to store files from both a Mac (13.0.4) and Windows (7) machines. I have a Droboshare that quite honestly never worked properly, but I’m including this info as well in case anyone has the magic remedy to make this all work. But I’d be satisfied with just being able to directly connect both computers independently to the Drobo for backup purposes. Any suggestions? Thanks in advance!