Open X-change uses CalDav as its Calendar system, as such, it can sync across a number of applications so that you can see your up-to-date appointments on your device of choice.
See the below guide for syncing your CalDav (OX) Calendar system to Mac
1: In OX Webmail, click on the "3 lines" (hamburger) menu in the top left.
2: Click "Calendar"
3: Highlight the calendar you'd like to set up syncing for, select the 3 dots and in the drop-down, select Properties
4. Copy your CalDAV URL.
5: Open your Mac's default Calendar app, at the top left select Calendar and then Accounts.
6: It'll open your Internet Accounts page. Select Add Account...
7: Select choose from a list.
8: Scroll down to select Add other account and then select CalDav Account .
9: In the pop-up, select Account Type: Manual , the User Name is your email address, and the Password is your mailbox password. Then paste the CalDAV URL into the Server Address and select Sign In . You'll then see the Calendar in your Calendar app.
