I've heard there is no such thing as a stupid question. Well, ok then, you asked an errant question, please ask one that has a single answer rather than an open ended question with hundreds of answers.
Yes, it will fit at least dozens of Micro ATX cases
No, it won't fit every Micro ATX case
In fact, it won't even fit ever full-ATX case, but it will fit the vast majority of full-ATX cases.
The problem is, cases come in all shapes and sizes. Many have a hard drive cage that gets into the way of larger cards, while many others do not. Some will allow the card to fit without a floppy drive, while the floppy drive gets in the way.
Worse yet, it also depends on the motherboard. Most Micro ATX cases have the PCI-Express slot in the top position, where it may or may not interfere with the floppy drive. Some have it in the next position down, where it may or may not interfere with a hard drive cage.
The only thing a rational person can do it LOOK and FIGURE IT OUT!