Another way to tell - Zoom way in by using CTRL + Plus repeatedly until eM Client refuses to zoom in any more (you are at MAX zoom). The font should be very large now.
Now reset zoom using CTRL + 0. Text goes back to normal size.
Now, try to use CTRL + Plus again… eM Client REFUSES to let you zoom in any more! This is because eM Client still thinks you are at MAX zoom!
Oh wait, it only works with the num pad-0. I alway use the normal 0 and that one is still not working.
But I can live with that.
I can confirm that CTRL + NUM PAD 0 works and the change is saved.
CTRL + 0 (where the 0 is on the top row on the main keyboard) does not get saved.
Many laptops do not have the NUM PAD 0 key. This needs to be fixed.
I can confirm CTRL-0 (top row) is not saved in v6.0.19179.0.
But thanks for the workaround, CTRL + NUM PAD - 0 works perfectly 
Hello. This will be fixed in the next release
please make this work with the number keypad too.
thx
In version 6.0.19861.0 it works for both num pad and top row keys.
in compose screen, CTRL-0 on num pad does not reset zoom, in my copy of 6.0.19861.0, on my asus.
Hi Johny,
maybe you need to switch the modus of your num pad by pressing on the [num lock] key first?
No, this is a bug. But I ave been informed that it should be repaired in upcoming patch.
Jan