Calendar is frozen - message "server error"
My calendar froze when I tried to copy information from email into future date - Now I am frozen on that date with a copy of the email also open. Frozen MESSAGE STATES: server responded with an error.
How can I unfreeze...did restart etc - please offer resolution that is simple to understand, for a novice. Thanx
MacBook Pro (13-inch Mid 2012), OS X Yosemite (10.10.3)