There were multiple space stations prior to 3.0, and along with Port Olisar were all added in 2.0.I don't know, what i do know is Port Olisar was still the only space station in 3.0, don't forget all the other space stations and planets were added during to course of 3.# patches.
Hurston in 3.3.5
ArcCorp in 3.5
Space Stations in 3.6
MicroTech in 3.8
Orison as it is now in 3.14
Cry Astro, was removed in 3.3

Cry-Astro Service 262
This Cry-Astro Service 262 was a repair and refueling space station that featured drones to perform its tasks. It was located in the orbit around Crusader and was added with Alpha 2.0.0 but later removed after its functionality was incorporated by other space stations. None November 9, 2018 -...
Covalex Shipping Hub, still there

Covalex Shipping Hub Gundo
Covalex Shipping Hub Gundo is a abandoned space station in the orbit of the moon Daymar in the Stanton system. The station suffered a explosion that partially destroyed part of the exterior which resulted in the death of all personnel.
ICC Scanhub, was removed in 3.0

ICC ScanHub Stanton
The ICC ScanHub Stanton, ICC Probe 849, was a deep space scanning station in the orbit around Crusader operated by the Imperial Cartography Center. Its purpose is to discover Jump Points or other stellar objects. It was added with the launch of the PU and temporarily served as a contact point...
And a bunch of Comm Array satellites, still there
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