How to share files and collaborate safely in Microsoft Teams, Slack and Zoom.
Secure Use of Collaboration Tools
Your team runs on Microsoft Teams, SharePoint, Slack and Zoom. Misconfigure them, or use them without thinking, and you expose sensitive information to people who should not see it.
The Sharing Settings Spectrum
⛔ Important
“Anyone with the link” shares are more dangerous than they appear. Anyone can forward the link to a competitor, a journalist or a member of the public, and you cannot control or track who opens it. If the link reaches a search engine cache, the file stays discoverable.
Microsoft Teams Security
Teams channels and chats rely on Microsoft’s platform security rather than end-to-end encryption. That platform security is strong, but it means:
- Adding a guest to the wrong Teams channel exposes everything in that channel to them
- External members remain in Teams after a project ends until someone removes them
- Sensitive files shared in chat remain accessible in OneDrive after the chat is deleted
✓ Key Point
Review who is in your Teams channels, especially teams with guest or external members. Remove guests who no longer need access. Check the Teams admin centre for a full list of external users in your tenant.
Secure Collaboration Checklist
| Platform | Key Security Actions |
|---|---|
| SharePoint / OneDrive | Use “Specific People” links for sensitive docs; set link expiry dates |
| Microsoft Teams | Review guest access quarterly; remove inactive guests |
| Zoom | Use unique meeting IDs; enable waiting room; lock meeting once started |
| Email with attachments | Consider SharePoint links with access controls instead of attachments |
| Slack | Audit third-party app integrations; restrict file sharing to approved channels |
Posting Sensitive Data in Chat
Never post the following in Teams, Slack, or any chat platform:
- Passwords or credentials (even temporarily)
- Customer personal information
- Financial data, account numbers
- Confidential business strategy
⚠ Warning
Chat platforms are persistent and searchable. A password posted in a Slack channel “just for a minute” remains in search results indefinitely and may be accessible to channel members, administrators, and any future legal discovery process. Use a password manager, never chat.
Mobile Techs IT Consulting
Is Teams sharing more than it should?
One forgotten guest account or “anyone with the link” share can expose your client data for years without anyone noticing. Mobile Techs IT Service helps Gold Coast businesses lock down their collaboration tools: Microsoft 365 and Teams security configuration, safe sharing policies, guest access reviews, and staff guidance on handling sensitive files. Home users welcome too, on-site or remote, anywhere in Australia.
Get your collaboration tools locked down Talk to us first
Call 1300 644 588 · office@mobiletechs.com.au
More on our managed IT services and remote security audit.
