score:1
In the application you have to state the main purpose of your journey. On the assumption that the primary reason you’re applying is to spend time with your colleagues in the Dutch office of your employer, it’s a Business visa since this best describes the purpose of your trip and it’s how you’ll be spending the majority of your time. On the other hand, if you planned to spend most of your trip sightseeing, with only a short visit to your employer, then it would be Tourism. The detailed itinerary that you will submit with your application should make it clear exactly how your time will be split.
Upvote:2
The company should send you an invitation letter, based on which you will get a short stay visa (type "C").
There are a few different types of visas, but for business visits, tourism, conferences, etc. you get the "C" visa. It is just the purpose of your trip, that determines what documentation you need to supply in support of your application.
You should have the following for your application:
In addition, bring the "usual" documents:
You should apply no later than 15 (working) days before your travel date; but you can apply as early as 3 months.
If this is your first time applying for any Schengen visa, I suggest applying as early as you can as your application may go through additional scrutiny.