# MPE/iX Operating Systems

- HP has released patches that make MPE/iX 5.5 Express 4 Year 2000 Certifiably Compliant.
- Like all previous MPE/iX versions, it will be backwards compatible on all supported HP 3000 PA_RISC servers.
- Customers must upgrade to MPE/iX 5.5 Express 4 to ensure Year 2000 compliance.
- To protect your Year 2000 project efforts, MPE/iX will be supported until the end of 2000.

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