The built in Apps can't be deleted like the added ones can. When you tap and hold, they don't get the little "delete x" symbol like the others.
If it is not visible on any screen, I would recommend backing up and restoring to see if it comes back.
Connect to your Mac, and in iTunes under the Summary Tab, Restore.
Tried to restore/update WITHOUT backup
it worked until 2/3 of the progress bar on the ipad then stopped moving
the progress bar on itunes reached almost 98% and stopped
ok I managed to restore/update on another Macbook
But i noticed that under Itunes preferences / devices there is no ipad nor iphone nor my apple TV.?
how do I add them?
iTunes should see your iPad and an iPhone and list them when they are connected to your computer.
So you have restored your iPad and it doesn't show under devices?
I don't have an Apple TV, but under iTunes Help it says to go into the iTunes Preferences, click Apple TV and select "Look for Apple TVs"
How is the iPad behaving now? Do you see the Calendar?
i had to delete the backup folder from Library/~
now everything is in order and syncing and backing up just fine.
thank you all
this case is now closed