An email address is optional. It will be used only to mail you
your passwords if you request them - we don't send unsolicited
email and never disclose email addresses or other information to
third parties. Please note that if you don't provide an email
address, there will be no way to recover lost calendar
passwords. You can modify your email address in the calendar's
"General Settings" page
The email address is also used as the "From" address for email
you may choose to send from your calendar. (E.g. "New Event"
notifications.) If you like, you can change the "From" address
in the "Email Settings" page.
Calendars which haven't been used for 6 months will
automatically be removed. A calendar is determined to be
"unused" if no events have been added or modified for 6
months.
You can - and should! - set security on your calendar after
creating it. At a minimum, set passwords for "Admin". To do
this, click the "Settings" link at the bottom of your calendar,
then click on "Passwords".