The best way to give access to your Virto Calendar is through SharePoint. You can add an external user to your SharePoint site and provide them access to view or edit the calendar there.
First, go to the SharePoint site you'd like to share.
Once there, click the "Members" button.
Then click "Add members". In a pop up find the "go to Outlook" hint and click it.
In your Outlook that opens, click "See all members".
Then click "Add members" on the right side of the screen.
Provide the email address of the external user with whom you wish to share the site. Click "Add" once done.
The external user will receive an email invitation to access the site (by clicking "Go to SharePoint" in the email).
They will need to log in with their email and provide a single-use code they will get from Microsoft via email and accept the permission request.
Users can view the site and its content, including calendars hosted on this particular site.
Users will only see (and edit, if allowed) the Virto Calendars on a site they're permitted to view – they won't have access to all the calendars your organization may have within the same tenant.
To add SharePoint events to your Outlook calendar, create an iCalendar (.ics) file to add the event to Outlook.
In our example, a team has a corporate Virto calendar overlay with events from different data sources. Some of them are taken from Outlook, and others from SharePoint.
Let us imagine that an HR manager has just created a SharePoint events list of soft skills training sessions for the team and has added these to the Virto calendar.
We have hidden some events on the calendar to highlight the events from the “Soft Skills Master Class” data source. You can find in this training schedule the courses for improving soft skills.
HR tells the team to choose which courses they’d like to attend. Each team member can look at the calendar and add the sessions they’re interested into their own Outlook calendar by following the steps below.
Click the event and click the “Add” icon on the bottom left of the tooltip pop-up.
Save the automatically generated .ics file and click it.
Click “Copy to My Calendar” in the Outlook event window as it appears on the screen.
The chosen event will appear in your Outlook calendar with the same data as in the Virto calendar.
In this way, the team members can add any events they wish to see to their Outlook calendar and join their chosen courses according to the schedule.