One of the cardinal sins of poker most players eventually learn is that limping in - especially from early position - is a terrible play. The two main reasons why limping from EP is a bad play is because 1) most of the table is still left to act, which means you are likely to get raised, and 2) you have given a ton of information away about your hand.
An EP limp basically shows that your hand isn't strong enough for a preflop raise, and you're just hoping and praying that nobody raises so you can see some cards for cheap. This being the case, most skilled players will simply raise a limper to either isolate them or steal the pathetic amount of chips they pushed out onto the table to see the flop.
Of course, with the rapid change of table dynamics as you move from limit to limit, nothing is an absolute in poker. And this is definitely true of limping in when you're at micro stakes tables. Micro stakes are known for lots of horrid, unconventional playing strategies, and this especially includes limping in from early and middle position. Going past this, most players in late position are often willing to just call with marginal hands so that they can see the flop.
In any case, you can get away with limping in during micro stakes games in hopes of seeing the flop. In fact, sometimes you are better off limping in rather than trying to push out a 3X or 4X the big blind raise in hopes of isolating 1-2 players because, seeing as how the stakes are so low, you'll often get 3-4 players who want to come along for the ride.
Now is this to say that you should always limp in from early or middle position in micro stakes games? Absolutely not because there will be some micro tables where everybody wants to raise, which certainly makes limping in from EP a bad play. Furthermore, you might even get some solid players who understand poker strategy well enough to take advantage of people who limp in from early position.
That's why it's extremely important to know the table you're playing at before choosing to make any such move. Some low limit tables will see everybody limp in, while others will see many late position players wanting to raise before the flop. So the key is to know the table dynamics, and make decisions about limping in or raising preflop from there.
Just know that limping in from any position in micro stakes games is a great way to get into hands cheap, and possibly see a favorable flop. What's more is that if you have some postflop skills, you will no doubt be able to take advantage of the other limpers when cards are on the board.
One more consideration is that you certainly don't want to be limping in with a big pocket pair like aces, kings or queens. In these instances, you may need to raise 8X or 9X the big blind (or more) to isolate one player. And even if everybody folds, it's better than losing your postflop advantage by having 2-3 players call your 4X or 5X the big blind raise.
