Mac Pro 3,1 is also known as Mac Pro (Early 2008).

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Per this and this, Mountain Lion Server appears supported, if you have enough disk and physical memory.

You can migrate from that release, but would have to acquire and upgrade to OS X Server 10.6 either from Apple (if that's still available, and you'll almost certainly have to call Apple to get a serial number for it) or maybe a new-old-stock 10.6 server (if you can find a copy of that) if you want to upgrade.

I'd try the call to Apple first, if you really want to try the upgrade and not a migration.

Here is the Lion-related migration and upgrade information, which does reference migrations from as far back as 10.5.8.

One potential way to migrate might be multiple external backups, then use Server Migration Assistant to haul in the old bits.

FWIW and given the vintage of that Mac Pro 3,1 box, I'd seriously consider replacing that box with a Mac Mini Server and maybe some external Thunderbolt storage. Much smaller box, newer, and likely roughly as capable. Given the vintage of your current Mac Pro server, the upcoming Mac Pro probably well exceeds your performance and storage requirements.

There's also an OS X Mavericks release 'coming this fall' per Apple announcements.

Oct 16, 2013 11:23 AM

Mac Os X Snow Leopard Server Download

Mac OS X Snow Leopard is renowned for its simplicity, its reliability, and its ease of use. So when it came to designing Snow Leopard, Apple engineers had a single goal: to make a great thing even better. They searched for areas to refine, further simplify, and speed up — from little things like ejecting external drives to big things like installing the OS. In many cases, they elevated great to amazing. Here are just a few examples of how your Mac experience was fine-tuned.

Features

Mac Os X Snow Leopard Server Download Iso

• 64 Bit
  64-bit computing used to be the province of scientists and engineers, but now this generational shift in computing gives all users the tools to apply the power of 64-bit to speed up everything from everyday applications to the most demanding scientific computations. Although Mac OS X is already 64-bit capable in many ways, Snow Leopard takes the next big step by rewriting nearly all system applications in 64-bit code¹ and by enabling the Mac to address massive amounts of memory. Now Mac OS X is faster, more secure, and completely ready for the future.
• Grand Central Dispatch
  More cores, not faster clock speeds, drive performance increases in today’s processors. Grand Central Dispatch takes full advantage by making all of Mac OS X multicore aware and optimizing it for allocating tasks across multiple cores and processors. Grand Central Dispatch also makes it much easier for developers to create programs that squeeze every last drop of power from multicore systems.
• Open CL
  With graphics processors surpassing speeds of a trillion operations per second, they’re capable of considerably more than just drawing pictures. OpenCL in Snow Leopard is a technology that makes it possible for developers to tap the vast gigaflops of computing power currently in the graphics processor and use it for any application.
• QuickTime X
  Snow Leopard introduces QuickTime X, a major leap forward that advances modern media and Internet standards. QuickTime X includes a brand-new player application, offers optimized support for modern codecs, and delivers more efficient media playback, making it ideal for any application that needs to play media content.
• Faster, more powerful Safari.
  Safari renders web pages at high speed and delivers a range of new features, including full history search, smart address and search fields, an innovative way to display your top sites, industry-leading support for web standards, and more.
  With Snow Leopard, Safari delivers up to 50 percent faster JavaScript performance thanks to its 64-bit support.6 In addition, Safari is even more resistant to crashes. It turns out that the number one cause of crashes in Mac OS X is browser plug-ins. So Apple engineers redesigned Safari to make plug-ins run separately. If a plug-in crashes on a web page, Safari will keep running.
• Out of the Box Support for Microsoft Exchange
  With Snow Leopard, the Mac is the only computer with built-in support for Microsoft Exchange Server 2007. So you can use your Mac — with all the features and applications you love — at home and at work and have all your messages, meetings, and contacts in one place.

Apple Mac Os X 10.6 Snow Leopard Server Download

General requirements

• Mac computer with an Intel processor
• 1GB of memory
• 5GB of available disk space
• DVD drive for installation
• Some features require a compatible Internet service provider
• Some features require Apple’s MobileMe service