multiple operating systems

Doug Easterbrook doug at
Mon Sep 20 15:49:26 UTC 2021

hi Grant.

Old programmers never die … they just use VM software.

I use Parallels 16 on Catalina.    If you buy parallels, waut till cyber week in the US, you might get a little money savings.   also, make sure DO NOT BUY the subscrption version, get the download licence version… then you don't have to pay for updates you won't use..

I’m running the following VM’s on my Catalina Mac Book Pro
- win 2000. (yes..  I still run it and use it to test things - even though it is 20 or so years old)
- win xp
- win 2008 server
- Win 2012 server
- Win 2016 server
- win 2019 servers
- win 10 (older and newer releases)
- Mac OS 10.6.8 (snow leopard)
- Yosemite,
- El Capitan
- Sierra
- High Sierra
- Mojave (so that I can still run studio 5 if need be)
- Catalina
- Big Sur
- Ubuntu linux

you have to be using an Intel based max to get all those.

and you can run the virtual machines in two modes.  One is normal mode, where it looks like you are running a windows VM in its own windowl, or coherence mode… which makes the windows MDI interface go away and you just see ‘windows’ windows within your mac environment.   its rather clever — so whiel the indow looks like another operating system, it is no longer in a container.  Kind of seamless.

Making the older operating systems took time ….  so I kept some images of them as backup.

Doug Easterbrook
Arts Management Systems Ltd.
mailto:doug at
Phone (403) 650-1978

> On September 20, 2021, at 7:17 AM, Bookit Enterprises <bookit.grant at> wrote:
> I am in my final year of using Omnis in my business, as I am shutting it down next spring, sometime after I turn 75, which I think is a reasonable retirement age.
> I am running Studio on Mac High Sierra, and still using DF files.  I use it for less than half an hour a day, so I am not interested in upgrading to a version of Studio 10, nor transitioning to SQL.
> However, High Sierra no longer gets security updates, so I would like to upgrade my operating system to Big Sur, and, eventually, Monterey.
> I would like to have a partition on my hard drive that runs High Sierra and Studio, and nothing else.
> A few years back, I did a partition and set up a second Mac OS, but found moving back and forth between operating systems annoying, so undid that.  Maybe my memory of the experience is incorrect, or I set things up poorly, or it’s just not a good solution.
> I may also want to add Windows to the mix, as there are some programs on Windows I would like to run, which don’t have Mac equivalents.
> Potential solutions seem to include Boot Camp, Wine, Parallels, Virtual Box, and VMware Fusion.
> Does anyone have recommendations among these, or some other solution I have not come across, to run High Sierra, Big Sur, and Windows 10 seamlessly without rebooting between systems, and having Big Sur as my primary desktop?
> Thanks in advance,
> Grant Thiessen
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