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Thanks, backup always good idea
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@MARSPATH &nbsp;- Thank you. Yes - I always keep backups before upgrading.
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@MARSPATH  - Thank you. Yes - I always keep backups before upgrading.

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I have a Macmini with OSX Mavericks and Parallels 10 installed. Can I upgrade to OSX Yosemite &nbsp;without corrupting current Parallels 10/Windows 8.1 installation?
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I have a Macmini with OSX Mavericks and Parallels 10 installed. Can I upgrade to OSX Yosemite  without corrupting current Parallels 10/Windows 8.1 installation?

Upgrade to OSX Yosemite with Parallels 10 installed

Apple's early computers ran on a variety of operating systems, including a Pascal version and one based on CP/M, before releasing its ProDOS with the advent of its 16-bit computer. With the release of the Lisa, which had its own OS, Apple and computing entered the graphical age; it was followed by the Macintosh, which offered a series of "System" operating systems. Other Mac operating systems included PowerPC until Apple acquired NeXT and folded it into the Mac OS. Current operating systems for Apple devices are Mac OS-X and iOS.

Apple OS

Mac OS X is the desktop operating system from Apple Inc., found on Macintosh computers. OS X consists of a Mach/BSD-based kernel, operating system interfaces primarily based on FreeBSD and additional frameworks (written in C, C++ and Objective-C providing user interface and application-level services.