De or het micro-onderneming?

The correct Dutch article is:

de micro-onderneming

Rule Words ending in -ing: almost always de. See the rule

How to use micro-onderneming

the micro-ondernemingde micro-onderneming
this micro-ondernemingdeze micro-onderneming
that micro-ondernemingdie micro-onderneming
our micro-ondernemingonze micro-onderneming
your micro-ondernemingjouw micro-onderneming
every micro-ondernemingelke micro-onderneming
which micro-onderneming?welke micro-onderneming?
a big micro-onderneming / the big micro-ondernemingeen grote micro-onderneming, de grote micro-onderneming