--- title: "The Only Secure Enterprise Calendar Solution for Microsoft 365" description: "Enhance calendar management in SharePoint Online and Microsoft 365 with Virto Calendar App. Try overlay features for a unified view of your calendars. Try now!" url: https://www.virtosoftware.com/microsoft-365/virto-calendar-overlay-app/ language: en-US last_modified: 2026-09-29T00:00:00+02:00 translations: de: https://www.virtosoftware.com/de/microsoft-365/virto-calendar-overlay-app/index.md --- # The Only Secure Enterprise Calendar Solution for Microsoft 365 See all your Microsoft 365, Outlook, SharePoint and internet calendars in one color-coded view. Your calendar data stays in your own Microsoft 365 tenant. (5/5) [4.9 (80 ratings)](https://appsource.microsoft.com/en-us/product/office/WA200005908?tab=Reviews) ## Key features: ### All department calendars on one screen Outlook, SharePoint lists, Planner, room mailboxes and Google or iCloud feeds in one color-coded view, without switching between sites. ### The whole year on one page Year, Year Quarter and Flat Year views show twelve months of deadlines, holidays and releases at a glance. ### Time off approved in the calendar Approve or reject vacation requests from a SharePoint list right in the calendar, color-coded by status. Trusted by Industry Leaders Warner Bros. Disney Sony UC Berkeley Motorola Teck Resources US Treasury University of Pittsburgh NASA Stockholms Stad FedEx Zespri and over 8,000 businesses worldwide ![What is Virto Calendar App?](https://www.virtosoftware.com/images/products/m365/virto-calendar-app-overview.webp) ## What is Virto Calendar App? Virto Calendar App is an enterprise-grade calendar overlay solution for Microsoft 365 and SharePoint Online. It consolidates multiple calendars—personal, team, departmental, or project-based—into a single unified, color-coded interface for real-time visibility and centralized planning. ## Core Use Cases ![Why Enterprises Choose](https://www.virtosoftware.com/images/products/m365/core-use-cases.webp) ### Overlay multiple SharePoint Online calendars Combine multiple SharePoint lists or calendar sources from sites and subsites into a unified visual schedule. No need to switch between pages—everything is in one place. ### Combine Outlook and Microsoft 365 calendars Integrate Exchange Online and Microsoft 365 group events with your SharePoint calendars. Keep personal, team, and corporate events together for complete transparency. ### Visualize shared calendars across teams and departments Create department-level views that display events from Marketing, HR, IT, and Project teams simultaneously. Simplify resource coordination and avoid scheduling conflicts. ## Comparison: Native M365 Calendar vs Virto Calendar App | Feature | Microsoft 365 / SharePoint Calendar | Virto Calendar App | | --- | --- | --- | | Calendar Sources | No. Single-site or personal only | Yes. Multiple Microsoft 365, Outlook & SharePoint sources + internet calendars like Google, iCloud, etc. | | Views | No. Single-site or personal only | Yes. Color-coded overlay, multi-source, customizable | | Coordination | No. Manual | Yes. Centralized and automated | | Audience | No. Team-level | Yes. Departmental and enterprise-scale | | Scalability | No. Limited | Yes. Enterprise-ready infrastructure | ### Upgrade your scheduling from visibility gaps to total calendar harmony. Choose the perfect plan to match your business needs. ## Technical & Enterprise Readiness Full compatibility with Microsoft 365, SharePoint Online, and Exchange Online environments. Flexible deployment — standard SaaS on Microsoft Azure (US) that processes your data without storing it, or Enterprise-tier custom deployment into your own infrastructure or Microsoft 365 tenant. Secure architecture aligned with Microsoft 365 governance, identity management, and permission frameworks. Enterprise scalability supporting large organizations, multi-departmental rollouts, and hybrid workforce scenarios. Performance-optimized for real-time synchronization without exceeding Microsoft Graph or API rate limits. ![Technical Enterprise Readiness](https://www.virtosoftware.com/images/products/m365/enterprise-readiness.webp) ## Integrations Connect to the tools your teams use the most so everyone works seamlessly in one place. Microsoft Teams Microsoft SharePoint Microsoft Planner Microsoft Outlook Google Calendar iOS Calendar Microsoft Exchange Microsoft Lists Richard C., Inside Sales Engineer - Flow Control (5/5) I was very impressed with the app integration for example linking it to upcoming MS Teams and Zoom meetings I had scheduled. Notifications gave me all the time I needed to ready myself for meetings/appointments. The overlay and UI in general are well put together. Avinash Y., General Manager, Program Management (5/5) Complete dashboard view is a great experience. Benifit of completely organised in a very short time. Chris S., Independent Beachbody Coach (5/5) Setting multiple data sources across site collections was very simple. The overlay allowed us to split our sites into multiple collections for each of permissions management while still allowing us to merge and display our calendar data in a company intranet site. Alan C., IT Officer (5/5) The Calendar is easy to use and configurable. I like the mini Calendar that can be added to front page and allow users to find the event easily. ## Sized to fit your business Choose the perfect plan to match your business needs. CUSTOM OPTION ### Enterprise For large organizations looking for advanced features RECOMMENDED $ 2,412 ~~$3,599~~ LIMITED TIME OFFER Per 100 users **Price valid with a 3-year agreement** LIGHTWEIGHT OPTION ### Virto Shared Calendar Simple to Use. Smart to Share. Affordable for Everyone ## Good to know - ### Install from Microsoft Marketplace A SharePoint or Global Administrator adds the app and approves its permissions once. [Documentation →](https://docs.virtosoftware.com/docs/calendar-overlay-pro/) - ### One license for all platforms Get SharePoint, Microsoft Teams and Azure license at once without any additional purchase. - ### Deploy in your own Azure Run the app in the Azure subscription linked to your Microsoft 365, under your control. [How it works →](https://www.virtosoftware.com/deploy-virto-apps-in-m365/) - ### Your data Your content stays in your Microsoft 365 tenant: the app processes it without storing it. [Trust & Security Center →](https://docs.virtosoftware.com/trust-and-security-center/) - ### Discounts and quotes 15% off for education, healthcare and charities; custom quotes for larger organisations. [Talk to sales →](https://www.virtosoftware.com/contact-sales/) The pricing outlined herein is valid only as to new purchases occurring on or after June 1, 2024. VirtoSoftware reserves the right to adjust its packaging and pricing at any time. ## Mastering Microsoft 365 Calendars Improve your Microsoft 365 calendar skills with tutorials and guides from VirtoSoftware's knowledge hub. - [Mastering Shared Calendars in Microsoft 365 and SharePoint](https://blog.virtosoftware.com/mastering-shared-calendars-in-microsoft-365-and-sharepoint/): Learn how to synchronize and share calendars effectively across teams, and see how Virto overlays simplify complex scheduling. - [How to Create an Office 365 Shared Calendar](https://www.virtosoftware.com/events/how-to-create-office-365-shared-calendar/): Build shared group calendars and learn when to switch from native views to an overlay-powered interface like Virto Calendar App. - [Top Shared Calendars for SharePoint Online](https://www.virtosoftware.com/events/top-shared-calendars-for-sharepoint-online/): Evaluate built-in tools vs third-party calendars to identify when your organization needs an enterprise-grade planning solution. ## FAQ ### Microsoft 365 & SharePoint Online Calendar Management **How do I manage multiple calendars in Microsoft 365?** Native Microsoft 365 tools allow individual calendar sharing, but they lack a unified overlay. Virto Calendar App brings all calendars into one centralized view for streamlined coordination. **Is there a better SharePoint Online calendar than the default one?** Yes. Native SharePoint calendars are site-specific and limited in visualization. Virto Calendar App overlays multiple SharePoint calendars, providing enhanced usability and visibility for enterprise teams. **Can I overlay Outlook and SharePoint calendars?** Absolutely. Virto Calendar App integrates Outlook, Exchange, and SharePoint Online calendars into a single synchronized view—ideal for cross-departmental scheduling. **Where is my calendar data stored?** Your calendar data stays where it already lives, in your own Microsoft 365 tenant (SharePoint lists, Exchange calendars, Planner) or in the internet calendars you connect. The app's backend runs on Microsoft Azure in the US and processes events in memory only; VirtoSoftware never stores your content. For Enterprise-tier customers, custom deployment into your own infrastructure or Microsoft 365 tenant is available. [Trust & Security Center](https://docs.virtosoftware.com/docs/virtosoftware-trust-security-center/security-overview/) **Is Virto Calendar App verified by Microsoft?** Virto Calendar App is published in the Microsoft commercial marketplace and has completed Microsoft Publisher Attestation — a detailed security, compliance, and data-handling report submitted to Microsoft. [View the attestation on Microsoft Learn](https://learn.microsoft.com/en-us/microsoft-365-app-certification/sharepoint/virtosoftware-virto-calendar-overlay) ## Related products - [Virto Calendar Web Part](https://www.virtosoftware.com/sharepoint/sp-calendar-web-part/): Merge events from multiple sources like Exchange, Google, and SQL into unified calendar view. - [Virto Shared Calendar](https://www.virtosoftware.com/microsoft-teams/virto-teams-shared-calendar/): Virto Shared Calendar is a standalone web app and Microsoft Teams-integrated solution designed for simple event management with tagging, color-coding, and anonymous sharing. - [Virto Calendar App](https://www.virtosoftware.com/microsoft-teams/virto-calendar-app/): The same Virto Calendar as a native Microsoft Teams tab — overlay all team calendars right where your team works.