Learn more about features
Compression & Encryption
Connect/MP ›
Connect/ZIP
(fka ZIP/390 MP)
z/OS · z/Linux · Linux x86 · Windows · macOS
95%
Max Compression
Ratio
256-bit
AES Strong
Encryption
zEDC
Native Hardware
Acceleration
4GB+
ZIP64 File
Size Support
5
Supported
Platforms
Simplify Efficient & Secure File Exchange and Archiving.
Fast, Efficient File Exchange
ZIP files streamline business workflows by compressing data by up to 95%, consolidating multiple files into one, ensuring compatibility across platforms and ZIP tools — leveraging a widely recognized, trusted format.
128/256-bit AES Encryption
ZIP's AES password encryption simplifies secure file sharing across platforms and ZIP tools, protecting sensitive data during storage and transfer — potentially reducing reliance on more complex and costly secure file-sharing solutions.
Built for Big Data
ZIP/64 support combined with zSeries zEDC and zIIP utilization enables high-performance native processing of very large files and archives (4GB+) — ideal for enterprise-scale datasets and high-volume data exchange and archiving.
Ranked #1 in Mainframe Cost Performance by Grok AI
With highly competitive pricing and native zEDC/zIIP integration, Connect/ZIP boosts performance and minimizes compute overhead and operational costs — offering a more efficient alternative to generalized third-party ZIP compression solutions. View full recommendation ›
Resources
Connect/MP is a powerful, enterprise-grade solution that combines industry-leading ZIP compression, seamless cross-platform integration, and robust legacy modernization capabilities. Unlike traditional approaches that require multiple tools and costly licensing, Connect/MP delivers these features in a unified platform—at a lower cost than comparable standalone mainframe ZIP solutions. It’s a smart, cost-effective investment for organizations looking to reduce operational overhead, streamline data exchange, and maximize the value of their existing mainframe infrastructure with modern, scalable access.
Whether you're modernizing core business systems, embracing hybrid cloud strategies, or enabling secure, real-time data sharing across platforms, Connect/MP delivers the performance, flexibility, and ROI your enterprise needs.
Connect/MP › Connect/ZIP
Features
z/OS · z/Linux · Linux x86 · Windows · macOS
General features
Mainframe-specific features
Resources
Connect/ZIP White Papers
White Paper
Value and Benefits of ZIP Compression Products Leveraging IBM zEDC and zIIP
Read White PaperOur Story
Connect/ZIP (fka ZIP/390) Timeline
Surprising to many is the fact that Data 21 has been in the mainframe ZIP compression space longer than PKWARE.
1993
PKZIP® for z/OS is born
Ascent Solutions Inc. develops and markets PKZIP® for z/OS, licensing the brand from Phil Katz — the “PK” in PKWARE.
1995
Data 21 becomes Ascent Solutions’ top reseller
Data 21 joins as an authorized reseller of Ascent Solutions — quickly becoming its most prolific partner.
2000
Phil Katz passes away — PKWARE changes hands
Following Phil Katz’s death, an investment firm acquires PKWARE from the Katz family.
Early 2000s
Ascent Solutions absorbed into PKWARE
The same investment firm acquires Ascent Solutions, folding PKZIP for z/OS under the PKWARE umbrella — and terminating all reseller agreements, including Data 21’s.
2004
Data 21 builds its own solution — ZIP/390
Rather than walk away from decades of expertise, Data 21 builds ZIP/390 for z/OS in-house and completes its first PKZIP replacement installation.
2004 – 2025
Continuous evolution — ZIP/390 MP
ZIP/390 is continuously enhanced and grows its customer base, with many organizations making the switch from PKZIP. The product evolves into ZIP/390 MP, expanding its capabilities across multiple platforms.
October 2025
Rebranded as Connect/ZIP
ZIP/390 MP is officially rebranded as Connect/ZIP — a key component of the Connect/MP Suite. The development team shifts focus to embedding AI-driven innovations across the entire product line.
Today
45+ years of mainframe expertise — and counting
With over 45 years of in-house mainframe development and support experience, Data 21 serves a global base of customers — including many of the world’s most prestigious companies.
Many of the world's top mainframe installations are using Connect/MP every day to simplify and accelerate mainframe file exchange, across the Enterprise and beyond.
Connect/ZIP › AI Review
Ranked #1 in Mainframe Cost Performance by Grok AI
Review date: August 27, 2025
Prompt: "Of third-party mainframe zip compression products which would you recommend?"
Recommendation: "For most z/OS mainframe environments, ZIP/390 MP (Connect/ZIP) is the best third-party ZIP compression product due to its excellent price-performance ratio, high compression efficiency (85–95%), zEDC/zIIP optimization, robust automation features, and strong security. It's particularly ideal for organizations looking to replace PKZIP/SecureZIP to reduce costs without sacrificing functionality."
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Product Update
ZIP/390 MP is now Connect/ZIP
ZIP/390 MP has been rebranded to Connect/ZIP — the same industry-leading mainframe ZIP compression you rely on, now part of the Connect/MP Suite.
Connect/MP brings together ZIP compression, cross-platform integration, web gateway access, and more — all in a single, cost-effective mainframe platform. Continue below to learn everything Connect/ZIP has to offer.