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Mainframe computers remained relevant in 2015 for several reasons:
1. **Reliability:** Mainframes are highly reliable and can run mission-critical applications without downtime.
2. **Legacy Systems:** Many organizations still relied on legacy mainframe applications.
3. **Security:** Mainframes offer robust security features for handling sensitive data.
4. **Batch Processing:** Industries like finance and insurance depend on mainframes for efficient batch processing.
5. **Cost-Effective:** Mainframes can consolidate multiple servers, reducing operational expenses.
6. **Long Lifecycle:** They have a long lifespan and continue to meet business needs.
7. **Vendor Support:** Major companies like IBM provide ongoing support and enhancements.
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