and as these are Xserve 3,1 are on the HCL for ESXi 5.5. Therefore I can legally accept the Apple EULA, and install Apple macOS Virtual Machines on them, because they have an Apple badge (Apple hardware).
If you do not have an Apple badge on your hardware, you are in breach of the Apple EULA. (Please do not ask me, because this cannot be discussed on Experts Exchange)
Andy's VMware vSphere tip#28: Not really a VMware tip. But PASSWORDS are no longer safe, turn on Two Factor Authentication where possible. Change your passwords today, check if you've been pwned! https://haveibeenpwned.com/ So many websites have been hacked in previous years, Dropbox, LinkedIn, Microsoft, Adobe, Last.fm, tumblr, and now Reddit.....
Your password from one of these sites, is now in the PUBLIC DOMAIN, as well as your email address, and telephone number, in spread sheets which are circling the internet!
If you are still using an OLD PASSWORD ANYWHERE change IT NOW.
Use a password manager to help you ensure all your passwords are strong and unique such that a breach of one service doesn't put your other services at risk.