Called off due to flooding! I bet Merc and some other teams are disappointed they wont be able to test their new kit - not sure how much data they will gain at Monaco.
Do you even bother taking updates to Monaco? Not like the data is representative and more likely to damage the parts, as well as driver confidence by changing the car.
Even though there may not to be a ton to gain, it's probably worth rolling the dice on the off chance it just works out of the box.
I wonder if it would have been possible to swap Monaco with Barcelona races? Then they could do their tests in Spain this weekend and everything would be there for the race next weekend,and then go to Monaco the week after that,if that makes sense. Just a thought.