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This article will outline how to 2-Way Calendar Sync Multiple O365 User Mailboxes. CiraHub consolidates numerous data sources from multiple platforms ensuring that the information remains consistent across devices and software.  


1. Log in to CiraHub. On the Hub & Spoke Setup page, select the Calendars object. Keep in mind that public folders can sync both contacts and calendars. Check out this article on how to sync public folder calendars.

Hub and Spoke Setup

2. Next, select the source type of your contact spoke. To sync a user mailbox within your organization, click Office 365 In my tenant and select User Mailbox and NEXT. This will take you to a list of User Mailbox calendars. (See figure below.)

Adding a Spoke

3. Select a User Mailbox Calendar you want to sync from the list. Click on the small arrow in front of a subfolder on the right to choose the item and click NEXT. In this example, a calendar named “Canadian Holidays” has been selected. (See figure below.)  

Choosing a User Mailbox Calendar

4. Create a name for your first Spoke and click Next. (See figure below.) 

Naming your First Spoke

5. Name your Hub, then click CREATE. (See figure below.) 

Naming your Hub

6. On the CiraHub dashboard, add another User Mailbox Calendar spoke using the +Spoke button. Click Office 365 In my tenant, then Mailbox Folder, and click NEXT 

7. Choose another User Mailbox Calendar and click next, then name your spoke and click CREATE. Alternatively, you can create a new calendar using the small green + button next to a subfolder. You should now see two spokes attached to the Hub on the CiraHub dashboard. You can add more spokes as required. (See figure below.)  

CiraHub Dashboard Showing Toe Spokes Attached to a Hub

8. Next, click on each Mailbox Calendar Spoke, select Sync Options, click Allow Hub to create and sync items in this spoke and click SAVE. (See figure below.) 

Modifying Calendar Sync Options


Depending on your organization’s needs, you can utilize a variety of additional sync options, such as private and tentative events, reminders, syncing meetings as appointments, and categorizing data in spokes. You can edit synchronization settings for each of your spokes using the options at the bottom of the page. For more information on each of these options, check out this article on Calendar Sync.

9. On the CiraHub Dashboard, click on the Hub, then click Sync Now to 2-Way Calendar Sync between multiple O365 User Mailboxes. (See figure below.) 

2-Way Sync on CiraHub Dashboard

Learn More About CiraHub!  

CiraHub is a two-way sync platform for shared contacts and calendars for Microsoft Office 365, Exchange Server, and other Microsoft Enterprise Applications users. The software is designed to make it easy for people lacking IT expertise to set up shared contact and calendar sync for their company.  

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