Virto Shared Calendar: the brief for your IT team

Someone in your organization wants Virto Shared Calendar. These are the answers an IT and security review asks for first.

For IT, security and procurement. Checked October 25, 2026.

Send to your IT team

At a glance

Calendar data is stored on VirtoSoftware's Azure
Sign-in and basic profile only
No admin consent needed
Added from the Teams app store
New calendars are visible to your whole organization
Share links work without a Microsoft account
No SOC 2 or ISO 27001 of our own
Free for up to 15 entries per calendar

What the app does

Virto Shared Calendar is a calendar your team keeps together, in a Microsoft Teams tab, a chat, its own app in Teams, or the browser. It does not read your Outlook or SharePoint calendars: it keeps its own events. iCal feeds, such as public holidays, can be shown next to them.

Where your data is

Calendar data is stored on VirtoSoftware’s Azure, in the United States: calendars, their events (title, times, description, attendees, categories, recurrence) and their sharing settings. This is what sets it apart from Virto Calendar App, which keeps none of your events.
After your account is closed, the data is deleted within 30 days.
Data processing terms for Virto Shared Calendar are agreed separately. Ask us before you buy it.

What the app asks Microsoft 365 for

Permission	What it allows	Needs admin consent
`openid`, `profile`, `email`, `offline_access` (Microsoft Graph, delegated)	Sign people in and read their name and email address	No
`identity` (Teams app manifest)	Know who the signed-in Teams user is	No
`messageTeamMembers` (Teams app manifest)	Let the app’s bot send direct messages to team members	No

The app signs in through its own Entra app, d02fa1c7-ef98-459f-ac0c-a12cf3b1819c. It does not read mail, files, Outlook calendars or SharePoint content.

A new calendar is visible to your whole organization, and in Default mode everyone can edit it, until its owner sets it to Restricted (owners and members edit, everyone else views) or Private (only the owner).
Share links work without a Microsoft account. A calendar’s owner can create a view-only or an editing link for anyone, and another Microsoft 365 tenant can add the calendar by its link.
Guests in your Teams see it too: an external user you add to a team can see that team’s Virto Shared Calendar.
How each setting works: Who sees what in Virto Shared Calendar.

Installation

Anyone in your organization can add the app from the Teams app store, with no consent screen for an administrator. Your Teams app policies decide whether third-party apps are allowed.
In the browser it runs at teams-calendar.app.

Certifications, plainly

Question	Answer
SOC 2, ISO/IEC 27001	VirtoSoftware has neither and does not plan to.
Microsoft 365 Certification	No. Virto Shared Calendar has completed Microsoft Publisher Attestation, a self-assessment Microsoft publishes, not an audit.
Hosting	Microsoft Azure. Azure’s own certifications cover the infrastructure, not VirtoSoftware’s processes.
Your questionnaire	We fill in your organization’s own form.

More for legal and security reviewers, including the EULA terms and how to request our security policies under NDA: Security & Compliance.

If your policy rules out vendor storage

Virto Calendar App keeps every event in your own Outlook and SharePoint and stores nothing with VirtoSoftware. It suits organizations of 100 users and more. Its brief for IT.

What it costs, and the alternatives

Microsoft 365 already has shared calendars. The question is what a calendar your team edits together, and shares by link, costs.

Microsoft 365 alone

No extra cost

Outlook shared and group calendars
Teams channel meetings

Compare the calendars in Microsoft 365 →