Please fill in this template when reporting a bug, unless you know what you
are doing.
Description of Problem:
Fail to copy&paste multiple appointments from calendar to mail attachment,
and from mail attachment to calendar.

Steps to reproduce the problem:
1. copy calendar items in mail attachment;
2. paste them onto calendar.
OR
1. copy calendar items in calendar;
2. paste them into mail composer.

Actual Results:
Nothing happen.

Expected Results:
the calendar automatically adds the specific pasted items.
OR
the mail composer accept the calendar items as mail attachments.

How often does this happen? 
Everytime.

Additional Information:
This offer an alternative to accept an assigned task. 
I can own this bug.