can i store steamed veggies at room temperature? and another question

or will they pick up a bacteria this way?
i lightly steam vegetables before work and put them in a plastic covered dish. i hate refridgerating them ebcause all we have at work to heat is a microwave and though i never looked for sure i just always figured they werent very safe and they ruin the veggies, so if i could keep the container in my locker at room temp it'd be much butter...
yes or no? and someone confirm my microwave thing? or am i just paranoid and its harmless |(besides ruining some foods nutritionvalue|)