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Microsoft announced its acquisition of Peer5 on August 10, 2021, to improve large-scale video delivery in Teams. Peer5’s browser-based, WebRTC technology let viewers’ devices share stream segments, helping reduce repeated traffic across corporate networks. The acquisition later became Microsoft eCDN; in 2026, that story belongs to Teams Town Halls and the unified events experience, not the retired Teams Live Events product.
What Microsoft acquired
Peer5 was an enterprise content delivery network (eCDN) provider. Unlike a public CDN, which distributes content through internet edge locations, an eCDN is designed to ease delivery inside an organization’s offices, branches, VPNs, and corporate network. Peer5 focused on internal video broadcasts, including company-wide meetings, town halls, training, and virtual events.
Microsoft said the acquisition would strengthen secure, high-quality, large-scale live streaming in Teams. It did not disclose the purchase price. Microsoft also said existing Peer5 customers could continue using the service and that certified eCDN partners would remain supported. Microsoft’s August 10, 2021 announcement and its acquisition history record the deal; neither states a transaction value.
Why large Teams broadcasts can strain a network
Teams event playback uses adaptive-bitrate streaming delivered as unicast: each viewer can receive an individual stream. When thousands of employees watch simultaneously, repeated streams can place substantial demand on internet connections and corporate WAN links. Microsoft says an eCDN can reduce that network burden. Microsoft’s Teams eCDN overview describes the current delivery context.
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- Without an eCDN: each viewer pulls a stream, so traffic can rise with the audience.
- With an eCDN: a smaller number of streams can enter a site, and participating devices may redistribute segments locally or across the enterprise network.
A public CDN and an eCDN address different parts of the problem. A public CDN distributes content around the internet; an eCDN focuses on avoiding unnecessary duplicate delivery within an organization’s own network.
How Peer5’s browser-based mesh worked
Peer5 used WebRTC, a technology that enables real-time communication between browsers. Microsoft described its system as a self-balancing mesh that could scale as viewer numbers increased, without additional endpoint installation or physical-network changes.
- A video stream reaches an initial viewer or group of viewers.
- Browser clients use WebRTC to communicate with other participating clients.
- Where network conditions permit, clients exchange video segments with nearby peers.
- The mesh adjusts as viewers join or leave, potentially reducing duplicate streams crossing a WAN or internet connection.
This does not mean every byte travels peer-to-peer or that every viewer becomes a useful peer. Results depend on browser support, endpoint availability, network policy, firewall and NAT traversal, VPN routing, and the number of viewers sharing a local network. Remote employees spread across home networks or isolated VPN segments may contribute less to a corporate mesh. The event still needs a reliable source stream, appropriate configuration, and connectivity to the first delivery points.
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Microsoft’s “no additional endpoint installation” statement is not the same as “no IT work.” Administrators still need to check browser compatibility, network segmentation, firewall behavior, and whether browser-to-browser traffic is allowed.
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Microsoft presented the acquisition as a response to customer demand for integrated eCDN support for large meetings and virtual events. The strategic value was not only bandwidth reduction: bringing delivery into the Teams and Microsoft 365 environment could connect event production with administration, support, and network analytics. For organizations already standardized on Teams, a first-party option could also avoid procuring and supporting a separate delivery platform.
That did not mean Microsoft intended to eliminate competitors. Its acquisition announcement said certified eCDN partners would continue to be supported, and its current documentation still describes partner options.
What happened to Peer5 after the deal
Microsoft integrated Peer5’s WebRTC and peer-to-peer approach into its communications products and introduced Microsoft eCDN as a standalone offer on September 7, 2022. The resulting product is intended for large corporate webcasts, town halls, all-hands meetings, and training. Microsoft’s Microsoft eCDN introduction describes the current product; the launch announcement explains its introduction.
The acquisition is therefore best understood as the origin of Microsoft eCDN, rather than as a continuing standalone Peer5 service. Microsoft’s current materials describe Microsoft eCDN as part of its communications offering, including Teams events and other compatible platforms.
What Microsoft eCDN means for Teams events in 2026
Teams Live Events were retired on June 30, 2026. Microsoft says events scheduled before that date remain supported through February 28, 2027, and directs customers to the unified Teams events experience and Town Halls for the forward-looking model. Microsoft’s Live Events planning documentation sets out the transition.
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Microsoft eCDN is the default for Teams events optimized for large audiences, such as Town Halls. Supported partner eCDNs remain available in documented scenarios, though Microsoft says some newer event features may require Microsoft eCDN when the first-party option is not selected. Check the current event configuration and licensing documentation before planning a production event.
Licensing and capacity
As of August 18, 2026, Microsoft’s eCDN purchasing documentation says Microsoft eCDN is included with Teams Enterprise for qualifying Town Hall configurations. For eligible enterprise-class users, including E3 and E5 license holders, the documented limits without a separate eCDN charge are up to 3,000 attendees for interactive Town Halls and up to 10,000 for view-only Town Halls. Larger interactive events require Teams Events Attendee Packs. Microsoft lists packs for 5,000, 10,000, 20,000, 35,000, 50,000, 75,000, and 100,000 attendees.
Microsoft’s original standalone offer was announced at $0.50 per user per month with an annual subscription. Microsoft now labels that per-user model legacy licensing, so it should not be treated as the universal current price. “Included” also applies to specified Teams Enterprise scenarios; it does not mean Teams licensing or larger-event packs have no cost.
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Microsoft eCDN and partner options
Microsoft identifies three partner eCDN options for Teams. Their capabilities differ, so compare them against your actual platforms and network rather than relying on vendor bandwidth-saving claims.
| Option | Approach and strengths | Consider it when |
|---|---|---|
| Microsoft eCDN | First-party WebRTC-based delivery integrated with Microsoft communications products. Microsoft says it can reduce LAN traffic by up to 98% under its documented conditions; that is a vendor claim, not an independent benchmark. | Your organization is Teams-centered and wants the simplest first-party administration and licensing path. |
| Hive Streaming | Software-based peer-to-peer delivery, network testing, stream controls, disruption alerts, analytics, and support for large internal video operations. Microsoft cites potential bandwidth savings of up to 99%, a vendor claim whose results depend on deployment. | Pre-event network testing, experience analytics, and managed operational support matter. |
| Kollective | Intelligent peering for live and on-demand enterprise video, with analytics through Kollective IQ and broader content-distribution use cases. | You need enterprise content distribution beyond a single Teams event. |
| Ramp eCDN | A mix of multicast, caching, and peer-to-peer delivery. Microsoft says Ramp can reduce bandwidth consumption by 90% or more; this is a vendor claim and depends on deployment conditions. | Your network needs mixed delivery methods or you have existing multicast and caching investments. |
Microsoft’s partner documentation describes these integrations. Third-party providers operate under their own terms of service and privacy policies, separate from Microsoft’s volume licensing and Online Services Terms. Review data handling, analytics retention, administrative access, and compliance requirements as part of procurement.
Who benefits most—and what administrators should test
Peer-to-peer eCDN is most promising when many people in the same office or branch watch the same event and WAN or internet egress is constrained. A mostly remote audience, small concurrent attendance, or highly fragmented network topology may produce less benefit. Organizations with a successful eCDN deployment or a need to distribute video across multiple platforms may also prefer to retain or assess a partner solution.
- Audience: estimate concurrent viewers, office-by-office density, and the share watching over LAN, VPN, home broadband, or mobile connections.
- Event model: identify whether the event is interactive or view-only and whether its capacity requires an Attendee Pack.
- Network: review WAN and internet egress, VPN hairpinning, segmentation, firewall and NAT behavior, and branch-office connectivity.
- Endpoints and operations: confirm managed-browser compatibility, administrative controls, pre-event testing, and quality-of-experience visibility.
- Security and privacy: verify that browser-to-browser traffic is permitted and assess provider terms, data residency, logging, retention, and administrative access.
- Broader video needs: check whether you also require video-on-demand optimization, multicast, edge caching, cross-platform analytics, or delivery beyond Microsoft products.
Before relying on claimed savings, run a proof of concept in representative offices and VPN conditions with the browsers, firewalls, and WAN links employees actually use. Microsoft cites reductions of up to 98% for its eCDN and up to 99% for Hive, while its documentation cites 90% or more for Ramp; those figures are vendor claims, not guaranteed outcomes for a particular network.
Microsoft’s acquisition of Peer5 gave Teams a first-party route to improve delivery for large internal video events. Peer5 supplied the browser-based mesh technology; Microsoft turned it into Microsoft eCDN. The current product decision is whether that first-party capability fits your Teams events and network—or whether a partner’s wider delivery features are a better match.
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