This guide explains how to synchronize Microsoft Outlook Windows contacts & calendars (Office 365 versions / 2019, 2016, 2013, 2010, 2007) with contacts & calendars hosted at Infomaniak, using an extension for Outlook available on caldavsynchronizer.org.

Preamble

• There is a paid alternative for Windows, Evo Collaborator, which offers a preconfigured profile for Infomaniak.
• Infomaniak services are compatible with any application supporting in particular CalDAV/CardDAV For additional help contact the support of the software used or a partner ; discover also the role of the host.

Configure Outlook CalDav Synchronizer

Outlook CalDav Synchronize allows to synchronize contacts & calendars via CalDAV and CardDAV protocols including multiple calendars (not shared only):

1. Download CalDav Synchronize for Outlook.
2. Close Outlook and start installing the above downloaded plugin:
   
3. Once the plugin is installed, open Outlook and click the new CalDav Synchronizer tab.
4. Click Synchronization Profiles.
5. Click on the + icon to create a first profile (for calendar or contacts - a second profile will have to be created later to synchronize the two).
6. Choose a generic profile type (first radio button):
   
7. Enter a profile name (calendar name or Infomaniak address book that you want to synchronize e.g.).
8. Check the sync box.
9. Click on the button [[▪ ▪ ▪] .
10. Click the New... button:
    
11. Enter a new folder name.
12. Choose the type of elements that the folder will contain (Calendar or Contacts).
13. Click on the parent folder to create the folder in its tree.
14. Validate with the OK button:
    
15. Validate with OK:
    
16. Open the assistant https://config.infomaniak.com/ to get information about synchronization with Outlook.
17. Click on the button to generate an application password (allows to bypass the 2FA of your user account for synchronization only):
    
18. Copy the information (password, URL and username) obtained on config.infomaniak.com.
19. Enter the email address, that of your user account.
20. Click on the button to test the settings:
    
21. Choose from the window that opens the Infomaniak calendar to sync.
22. Click the OK button:
    
23. Additional information may then appear automatically in some fields.
24. Record a second profile if necessary (start in point 4 in this case).
25. Finish with OK at the bottom right.
    
26. A restart of Outlook may be required to update the added information.

Solve duplicate events

If you notice duplicate events in your Outlook calendar without these being on calendar.infomaniak.com, apply these settings:

1. Click to View Advanced Settings.
2. Click Event Mapping Configuration.
3. Check the Use GlobalAppointmentID for UID attribute box.
4. Check the Cleanup duplicate events box.
5. Save the changes by clicking on the OK button:
   

This deletion of dual events and therefore potentially duplicate invitations, may lead to notification of refusal of the event to the organizer, however this does not impact the initial choice of the participant.

What about macOS?

There is an alternative for Outlook / Exchange on macOS, via the script python ews-caldav-sync:

• Unlike an ICS file import provided by Outlook Web that only includes the last weeks of events, the script will import all calendar events, including event series, without tasks.
• Synchronization by this script is only in one direction, from Microsoft Exchange to the CalDAV server. It is recommended that it be restarted at regular intervals.