Editing OpenVMS (section)

===Influence===
During the 1980s, the MICA operating system for the PRISM architecture was intended to be the eventual successor to VMS. MICA was designed to maintain backwards compatibility with VMS applications while also supporting [[Ultrix]] applications on top of the same kernel.<ref name="mica-business-plan">{{cite web|url=http://www.bitsavers.org/pdf/dec/prism/mica/Mica_Software_Business_Plan_Mar87.pdf|title=MICA Software Business Plan|author1=Catherine Richardson|author2=Terry Morris|author3=Rockie Morgan|author4=Reid Brown|author5=Donna Meikle|date=March 1987|access-date=January 4, 2021|website=Bitsavers}}</ref> MICA was ultimately cancelled along with the rest of the PRISM platform, leading Dave Cutler to leave DEC for Microsoft. At Microsoft, Cutler led the creation of the [[Windows NT]] operating system, which was heavily inspired by the architecture of MICA.<ref>{{cite book |last1=Zachary |first1=G. Pascal |title=Showstopper!: The Breakneck Race to Create Windows NT and the Next Generation at Microsoft |date=2014 |publisher=Open Road Media |isbn=978-1-4804-9484-8 |url=https://books.google.com/books?id=o2IkAwAAQBAJ&q=%22Dave+Cutler%22+march+13&pg=PT9 |access-date=January 4, 2021|language=en}}</ref> As a result, VMS is considered an ancestor of [[Windows NT]], together with [[RSX-11]], [[VAXELN]] and MICA, and many similarities exist between VMS and NT.<ref>{{cite web|url=https://www.itprotoday.com/compute-engines/windows-nt-and-vms-rest-story|title=Windows NT and VMS: The Rest of the Story|author=Mark Russinovich|date=October 30, 1998|access-date=January 4, 2021|website=ITPro Today}}</ref>

A now-defunct project named ''FreeVMS'' attempted to develop an [[open-source software|open-source]] operating system following VMS conventions.<ref>{{cite web|url=https://www.osnews.com/story/8953/freevms-010-released/|title=FreeVMS 0.1.0 Released|author=Eugenia Loli|date=November 23, 2004|website=OSnews|access-date=April 2, 2022}}</ref><ref name="freevms-homepage">{{cite web|url=http://www.freevms.net/|title=FreeVMS official web page|archive-url=https://web.archive.org/web/20180908204358/http://www.freevms.net/|archive-date=September 8, 2018}}</ref> FreeVMS was built on top of the [[L4 microkernel family|L4 microkernel]] and supported the [[x86-64]] architecture. Prior work investigating the implementation of VMS using a microkernel-based architecture had previously been undertaken as a prototyping exercise by DEC employees with assistance from [[Carnegie Mellon University]] using the [[Mach (kernel)|Mach 3.0]] microkernel ported to [[VAXstation#VAXstation 3100 Series|VAXstation 3100]] hardware, adopting a multiserver architectural model.<ref name="wiecek1992">{{ cite journal | url=https://archive.org/details/1992-proceedings-microkernels-seattle/page/187/mode/1up | title=A Model and Prototype of VMS Using the Mach 3.0 Kernel | journal=Proceedings of the USENIX Workshop on Micro-Kernels and Other Kernel Architectures | last1=Wiecek | first1=Cheryl A. | last2=Kaler | first2=Christopher G. | last3=Fiorelli | first3=Stephen | last4=Davenport, Jr. | first4=William C. | last5=Chen | first5=Robert C. | date=April 1992 | access-date=September 20, 2021 | pages=187–203 }}</ref>