1. Calendar in CRM should be accessible vie tabs in menu

2. All task and events should be added to calendar (as is now). BUT - in calendar should be possibility to move particular tasks and events to new date. If there are will be move via calendar, in CRM, in Activities tab - dates of task and events should be automatically  updated.

3. There should be also possible to sync Zoho Calendar and Google Calendar (full, two way sync, writable in to all directions)