Find your Exchange on-premises build / version

First of all, open your  Exchange console and run this command:

As you can see, your version is 14.3 with build level 123.4

Now we can go here to see what means : https://technet.microsoft.com/it-it/library/hh135098(v=exchg.150).aspx

In our case, we have one “simple” SP3 .

After the update, if you don’t see a build change or what you are expected , open a power-shell and run this command:

As you can see, in my case, I have a wrong (old) build level but my real build level is 14.03.0399.002 (rollup21)