I didn't know if it was like using NTFS partitions with 98, IE you can't. I wasn't sure if anything that wanted to access it had to be capable of addressing all 3TB or if it was only up to the host system to address all the space and you could subsequently connect with any OS that could read NTFS whether it could make 2+TB partitions itself or not.
The protocol used on Windows machines to access network drives is SMB/CIFS. As long as both machines (server and client) are capable of using this protocol, the underlying storage medium, including the file system and partitioning, is irrelevant.
That's what enables a Linux machine to share files to Windows machines -- the Samba package is responsible for the server side of the SMB/CIFS protocol, and can share out shares and files, even though the underlying file system might be EXT3.
In short, yes, even a Windows 98 machine could read/write files to your server, even though the Win98 machine could never handle a volume >137GB or an NTFS file system.