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Teams disables file attachments in chats with external users by default. One Files Policy setting, changeable only through PowerShell as of May 2026, turns it back on.
March 2026 in Microsoft 365: the new E7 suite and Agent 365 go GA May 1, Entra Backup and Recovery enters preview, external MFA hits GA, and SPO one-time passcodes get a retirement date.
Guest accounts enter Microsoft 365 through deliberate Entra invitations and through everyday file shares that mint identities automatically. The SharePoint B2B integration setting decides which.
February 2026 in Microsoft 365: EWS retirement begins October 2026, the free CSP grace period dies May 4, Purview Posture Reports hit GA, and Entra guest governance now needs an Azure subscription.
When a vendor gets breached, their compromised guest account walks straight into your tenant. The layered Microsoft 365 model that stops it: sharing defaults, guest MFA, download limits, labels, and access reviews.
Ignite 2024 set the Teams roadmap for 2025: speech-to-speech interpretation in nine languages, email-verified external attendees, bot-blocking CAPTCHA, and a merged chat and channels experience.
External collaborators do not need download rights to do their job. Two settings force guests into authenticated, browser-only access and block local downloads in SharePoint and OneDrive.
Out of the box, SharePoint generates Anyone links with edit rights. Here is the staged path to safer sharing defaults, with the exact guest and Gmail user flows that generate tickets.
Microsoft Teams holds chats, meetings, and files for the whole company. These eight CIS-mapped settings control who gets in, what apps run, and where data can leak.
July 2022 for MSPs: Teams shared channels hit GA, Viva Engage replaces the Communities app, the V1 Exchange Online PowerShell module heads for retirement, and the partner program overhaul gets a date.
May 2021 for MSPs: the Microsoft 365 Lighthouse service plan lands in Business Premium, external group chat hits GA with 250 participants, and reply-all storm protection becomes tunable.
External sharing is on by default across SharePoint Online. Here are the four sharing modes, how authenticated and anonymous external sharing actually work, and where to lock it down.
