The ability to add people from outside the organization to Microsoft 365 groups and Teams as guest objects in Microsoft Entra ID, controlled at tenant, team and sensitivity-label level.
Title graphic: Guest access (Concept)
Type
Concept
Key points about Guest access
SharePoint sprawl is a digital landfill of dead projects, duplicate final_v7 files, ghost guest access and broken links. · Find and Remove Orphaned SharePoint Sites
Dataverse should not be treated like SharePoint with big buckets and broad roles, because that turns guest access into a breach waiting to happen. · Prevent Dataverse Guest Access Data Leaks
Your “private” Microsoft Teams channels are quietly bleeding data – and default settings are to blame. In this episode, we walk through real-world incidents where dormant guest accounts, synced libraries, and careless PII pastes turned Teams into a silent…
This episode dives deep into the foundations of Microsoft 365 security and why locking down your M365 tenant has never mattered more. The conversation opens with a look at what “Microsoft 365 security” truly means today: a constantly evolving mix of policies…
In this episode, we dismantle a common Microsoft Teams governance myth: that the Teams Admin Center is the central command for controlling Teams behavior and enforcing governance. Most organizations treat the Admin Center like a control tower — but it’s…
As Microsoft 365 grows, Teams, SharePoint sites and guest accounts multiply until collaboration turns into noise. In this interview, Heiko Brenn of BCC uses music metaphors to show IT leaders and governance owners how ownership, lifecycle management…
Microsoft Teams channels are one of the most powerful yet misunderstood features in the entire Teams platform, and using them correctly can make or break your organization’s communication. In this episode, we dive into how Teams channels actually work, why…
Manual SharePoint reviews don’t scale. Use PnP PowerShell + Microsoft Graph + Azure Automation to enumerate every site, expand nested/group/inherited permissions, and deliver a clean, daily report. App-only auth, throttling-safe queries, and diff alerts turn…
Your SharePoint isn’t messy – it’s a digital landfill you’re paying to host. Dead projects, duplicate “final_v7_REAL_final” files, ghost guest access, broken links, and a Copilot happily hallucinating on rotten content. This video shows you how to turn that…
This episode argues that the biggest governance mistake in Microsoft 365 isn’t misconfiguration—it’s timing. Most organizations treat governance as something to “add later,” but by doing that, they unintentionally design failure into the system from day one.…
Guest access in M365 isn’t a switch—it’s three identity layers and four services that don’t always agree. That mismatch creates silent exposure: a guest “allowed” in Teams can inherit broader SharePoint access; Purview often spots it after the fact. The fix…
Your Microsoft 365 tenant is probably full of “guests who never left.” Contractors, vendors, and partners get invited for short projects—and their accounts quietly live on for years. That sprawl creates hidden risk: lingering access to SharePoint and Teams…
Your Power App didn’t get “hacked”—it was over-permitted. Treating Dataverse like SharePoint (big buckets, broad roles) turns guest access into a data breach waiting to happen. Dataverse is a relational fortress built on granular privileges…
Flip One Azure AD Switch, Break Three Workflows? The Hidden B2B, Teams, and Conditional Access Domino Effect—And How to Stop It If B2B Direct Connect “works” until presence, file sharing, or guest invites start failing, you’re seeing the silent chain reaction…
External Users In Teams Meetings Guide · Mirko Peters Learn external users in Teams meetings with practical guidance on setup, privacy, security, accessibility, governance, and real-world use.
External Chat In Microsoft Teams Guide · Mirko Peters Learn external chat in Microsoft Teams with practical guidance on setup, productivity, security, governance, and real-world use.
Mastering Microsoft Teams External Collaboration Controls · Mirko Peters Mastering Microsoft Teams external collaboration controls: Learn to manage external access, invite people outside your organization and configure settings in the Teams admin center
The show notes mention downtime, security vulnerabilities and knowledge dependency on specific individuals. Sprawl also reduces productivity and collaboration, and ghost guest access adds risk nobody is watching. · From the episode: Find and Remove Orphaned SharePoint Sites
Why is Microsoft 365 guest access risky?
It spans three identity layers and four services that can disagree. A guest allowed in Teams may inherit broader SharePoint access, which creates silent exposure that Purview often spots only afterwards. · From the episode: Fix Microsoft 365 Guest Access Risks Across…
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