How many operating systems are allowed to install a single computer?

Question

I have already install windows 7 and ubuntu in my pc, but now I want to install windows server 2012 in same computer. Is it possible?

Answer 1

There is no inherent limit to the number of operating systems that can be installed on a computer.

Issues you may encounter installing many operating systems include a limit on hard drive partitions and overwhelming your bootloader. Most people rarely have to worry about these issues.

Answer 2

You can install as many you want but, before to try to install X systems you should have some things in mind.

1. CPU Architecture: If you want to install an operating system you must to be sure if that operating systems runs with your CPU.
2. Minimun RAM Requirement: The Minimun Amount of Memory used to run the operating system.
3. Hard Disk Size: You must to be sure you have enough space in your hard disk to install the Operating System.
4. Graphics: The minimum Specs of the Video Card to run the selected operating system.
5. MBR/GPT: Master Boot Record / GUID Partition Table Limits.

Keep this in mind as minimun.