Can PC and Xbox 360 Players Play Call of Duty 4 Together? No

No. Call of Duty 4: Modern Warfare (2007) has **separate, incompatible online ecosystems**:

• PC: IWNet / Steam / dedicated servers (IW4x, MW2SA, etc.).
• Xbox 360: Xbox Live (demonware backend).
• PS3: PSN (separate from both).

Why No Cross-Play?

• Different netcode, patch versions, anti-cheat.
• Mouse/keyboard vs. controller balance gap.
• No cross-platform infrastructure existed in 2007.

Modern Workarounds

• CoD4: MW Remastered (2016) — Still no cross-play (PS4/PC/Xbox separate).
• IW4x / MW2SA / SM2 (PC clients) — Custom servers, but PC-only.
• Xenia / RPCS3 Emulation: Play 360/PS3 version on PC, but still connects to console servers (often dead).

To play with friends, everyone must be on the **same platform & same game version**.