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AddressbookApplication management:
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Inernet("public" service) and Intranet

Version 1.0+:
- Single-user local application
- Fields:
  + Gender
  + Surname
  + Family name
  + Company name
  + Street + number
  + ZIP code
  + City
  + Landline number
  + Fax number
  + Cell phone number
  + Email address
  + Birth day
  + Comment (?)
- Edit own data
- Add new contact
- Edit contacts
- Delete contacts
- Categorization of contacts

Version 1.1+:
- Permanent storage in database

Version 2.0+:
- Multi-user web application
- Local user registration / login / resend confirmation link / password
  recovery
- User groups (aka. teams)
- Administration area (user role)
  + Create/edit/delete groups
  + Edit/delete/lock/unlock user
  + Assign user roles/rights
- Allow other users / groups to view addressbook
  + Full addressbook
  + Only some categories
- VCard export
  + Allow users/guests (not recommended)
- XML export of addressbook and compressable (ZIP)
- Form to contact other user/group without need of mail program
  + User can disabled this
- Directory for ussers/groups (who allowed to be listed)
  + Simple click to add user to own addressbook
  + Search form?

Version 2.1+:
- Multi-language support

Version 2.2+:("socialized")
- "Social login" (OpenID consumer)
  + Connect user account to social account
  + Sync own data?
- "Social profile"
  + OpenID provider
  + RSS/activity feed 

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Time esitmation:
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- 1.0 (console):
  + 2 days

- 1.1 (database):
  + 2 day
  + Initial tables: contacts, categories, contact_category

- 2.0 (web):
  + 3 days
  + Additional tables: admins (?), admin_rights, groups,
   users, user_contacts, user_user_rights, user_category_rights, 

- 2.1 (language)
  + 1 day
  + Additional tables: languages (disable, enable language "pack" ?)

- 2.2 (social):
  + 3 days
  + Additional tables: ???