Shared calendar between outlook 365, andoid outlook calendar and ios calendar

Job ID: 31311286

Budget: $30 – $250 USD

Synchronize calendars between multiple devices
Allow calendars users share between users (past and future)
On outlook, be able to
-- manage shared calendars (assistant be able to schedule meeting/appointment for me or other persons with previous permission)
-- show availability of calendar (previous shared) participants on scheduling an appointment

On android, be able to see synchronized calendar on outlook mobile
On IOS, be able to see synchronized calendar

users quantity: 20
actual email protocol: IMAP (no exchange)

Accept two types of solutions
-- third party software (free or paid) with integration - you will be paid for configuring it but all costs must be clear
-- free solution with webdav/caldav or similar configuration using a vps/owncloud or similar files depot.

Criteria: best price on proved working solution
Related categories: iPhone Android Microsoft Outlook