Store your personal calendar on server.

Supports multiple calendars per person.

You can create different calendars for different purpose. For e.g. Home, Office, Birthday etc.

Share your selected calendars with selected people.

Share your Free or Busy information with others.

Create and store tasks not just time and date based events.

Supports importing and exporting of calendars in iCalendar (ics) format.

Supports iCalendar (ics) format which is also supported by Google calendar, Apple calendar, Yahoo! calendar, Lotus Notes etc.

Uses CalDAV based internet standards for accessing calendars.

One can also use AJAX based web interface for accessing personal calendars.

Supports ActiveSync for direct access to personal calendars via latest smart phones.

BtCal module also supports creation of addressbooks. (CardDAV based)

You can also import / export your addressbooks (vCard format).

If your calendar client supports it, you can also get reminders for the upcoming events.

BtCal module also supports creation of address books. (CardDAV based)

You can create multiple personal address books. This allows you to create different address books for different purposes. For e.g. Relatives, Official etc.

The following clients are supported:

1. Mozilla SeaMonkey
   (Browser, E-mail, Calendar – all in one)
2. Mozilla Thunderbird
   (with Lightning add-on)
3. Apple iCal
4. Apple iPhone
5. Android phones
   (using aCal app or suitable connector)
6. Any CalDAV client which supports iCalendar (ics) format

Availability of certain features may depend on the client used.