Why is it important that your case and motherboard share a compatible form factor?

When might you want to use a slimline form factor?

What advantages does ATX have over Micro-ATX?

What are two operating systems that can be installed in systems using Mini-ITX motherboard?

Is it possible to identify the form factor without opening the case?

It is important for your case to share a compatible form factor because different cases have different compatibilities. For example if you have a Micro-ATX case, a full ATX motherboard would be too large to fit into that case.

You might want to use a slimline form factor if you have limited space.

With a full ATX you will be able to add more as well as larger components, where as if you get a Micro-ATX, you would be limited.

The two OS are Linux and Windows.

Normally you can eye ball it by determining the size and shape of the case.