Earlier this week, Apple announced their next version of Mac OSX at their annual developer's conference called OSX 10.10 Yosemite. For those of you who are part of Apple's Development Program and would like to test drive the latest Developer Preview, you can quickly and safely do so by running it inside a Virtual Machine using either VMware Fusion or VMware vSphere.

Disclaimer: It is important to note that Mac OSX 10.10 is not officially supported by VMware because Apple has not officially GA'ed, however it will run fine for the most part.

UPDATE (07/26/14) - I was able to install the latest OSX Yosemite public beta using the same instructions listed below.

It is highly recommended that you perform an upgrade using the .app from an existing installation of Mac OSX to Yosemite for optimal performance. There are currently some known issues with a fresh installation which may cause some problems, this is currently being investigated by VMware Engineering.

Installing OSX Yosemite on Fusion:

For Fusion users, I recommend using the latest VMware Fusion 2014 Tech Preview and selecting OSX 10.9 as the guestOS. If you have any feedback on the Tech Preview of Fusion, be sure to leave a comment on the Fusion Community Forums. Here are a couple of screenshots going through the upgrade as well as a successful boot of Mac OSX 10.10.

Installing OSX Yosemite on vSphere:

For vSphere users, you will need to be running vSphere 5.5 and using Virtual Hardware 10 which provides support for Mac OSX 10.9 as a guestOS. If you need to perform a fresh installation of OSX, you can follow the detailed instructions here which requires a quick format of the underlying virtual disk before starting the installation. Below is a screenshot of Mac OSX 10.10 running on vSphere on top of my Apple Mac Mini.

Here are a couple of things I noticed about the current Beta of OSX 10.10:

• Installing VMware Tools does not work and just seems to hang. If you need VMware Tools, make sure you install it before upgrading
• After upgrading from OSX 10.9 to 10.10 running on VMware Fusion 6.0, it seems to hang after reboot
• It feels a bit sluggish, potentially from being the first Beta drop

Even with some of these issues, I still think it is pretty cool that you can run a Beta version of OSX that was literally released a couple of days ago. I know VMware Engineering is already hard at work on figuring out the issues and optimizing OSX 10.10 to run just as smooth as past releases of Mac OSX. I am confident by the time Mac OSX Yosemite GA's, that it will be running flawlessly! I also would like to thank Regis Duchesne for sharing some tips on getting OSX 10.10 up and running.