The microtower is a form factor for a PC case, which is also sometimes called Micro-ATX. This is derived from the actual ATX standard introduced by Intel in 1996. With this feature, you can directly identify the format of a used desktop PC from our range.
The microtower form factor also allows for conclusions on which format a mainboard can have to accommodate in the housing. With Micro-ATX, the maximum dimensions are 244 mm x 244 mm, so this should be considered at the time of purchase. In addition to the main board, the ATX standard is also important for power supplies and plug-in cards.
If you are only looking for a new housing for your PC, you should check in each case whether the respective components can be accommodated in it. If, on the other hand, a complete computer system is used in the microtower, the form factor primarily provides the possibilities for later upgrading.