Most Microsoft 365 tenants are paying to store data they do not need. TeamsFox finds it, classifies it, and moves it automatically.
April 2026 | 6 min read
At a Glance
1. The Storage Problem Hiding in Plain Sight
Microsoft 365 gives every organisation a cloud storage estate: SharePoint sites, OneDrive accounts, Teams file stores, and Exchange mailboxes. On paper, it looks managed. In practice, most IT teams have no idea what is inside it.
Files accumulate for years. Version histories balloon. Duplicate documents spread across sites. Old project folders stay alive long after the project ended. Nobody deletes anything because nobody is sure what is safe to delete.
This is ROT: Redundant, Obsolete, and Trivial data. Research from Veritas indicates that approximately 73% of enterprise data falls into one of these three categories. In a M365 environment, ROT data Microsoft 365 means that a substantial portion of your SharePoint and OneDrive storage is working against you.
2. What ROT Data Microsoft 365 Actually Costs: Direct Spend and Compliance Risk
Storage is not free, and it is not static. As your tenant grows, the cost grows with it. Most IT teams only notice when they hit a limit or see an invoice spike.
The financial exposure comes from two directions. First, direct storage cost: the more you store at the hot tier, the more you pay. SharePoint and OneDrive storage uses Microsoft’s commercial rates, which rise with each annual pricing adjustment. Second, governance cost: unmanaged data creates compliance exposure. Redundant files with sensitive content, obsolete records past their retention window, trivial duplicates scattered across sites, all create risk that most organisations cannot see.
Manual storage reviews take time nobody has. Reports from the Microsoft SharePoint admin centre give aggregate numbers, not file-level detail. Without granular visibility, the right decision is impossible: you cannot safely archive what you cannot identify.
You cannot manage what you cannot see. Most Microsoft 365 storage problems are not technical. They are a visibility problem.
3. From Hot to Cold: How Azure Cool Storage M365 Cuts Costs
Not all data needs to be immediately accessible. Older project files, archived communications, legacy reports from three years ago: none of these require hot storage. Azure Blob Storage’s Cool and Cold tiers offer significantly lower costs for infrequently accessed data, and Microsoft’s Archive tier goes further still.
The challenge is that moving data to Azure cold storage manually is complex. You need to identify candidates, assess access patterns, verify retention policy compliance, move files without breaking links or permissions, and document the action for audit purposes. Without automation, this becomes a project rather than a process.
TeamsFox handles this end-to-end. The platform scans your tenant, identifies data candidates based on access age, file type, duplication, and metadata, and presents IT teams with a clear action plan. Where policies allow, TeamsFox moves ROT data Microsoft 365 automatically to Azure Cool Storage, cutting storage costs significantly while keeping files accessible via standard Microsoft interfaces. For a detailed comparison of this approach against Microsoft’s native option, see Microsoft 365 Archive vs TeamsFox.
4. How TeamsFox Identifies ROT Data Microsoft 365 Across Your Tenant
TeamsFox scans every file in your Microsoft 365 environment at the file level. Not folder summaries, not site-level overviews. File by file.
The platform classifies data across three ROT categories:
- Redundant: Duplicate files, near-duplicate versions, and content that exists in multiple locations. TeamsFox surfaces consolidation opportunities.
- Obsolete: Files that have not been accessed in a configurable period, content from decommissioned projects or departed users, data past its retention window. TeamsFox flags these for review or automated action.
- Trivial: Low-value content that consumes disproportionate space. Large media files, outdated downloads, and personal storage misuse. These are surfaced as quick wins.
Once identified, IT teams act through the TeamsFox dashboard: archive, delete, or tag for review. For recurring ROT data Microsoft 365, TeamsFox applies automation rules, so storage governance stays clean without ongoing manual work.
RISK: Unreviewed storage creates compliance exposure that most IT teams underestimate. Sensitive documents in orphaned SharePoint sites, personal data in old OneDrive accounts, outdated records past legal retention windows: each carries regulatory risk under GDPR and increasingly under NIS2. Microsoft Storage optimisation is not just a cost exercise. It is a compliance requirement.
5. Real Results: 40% M365 Storage Cost Reduction and 60% Less Admin Work
TeamsFox customers consistently achieve a 40% reduction in Microsoft 365 storage costs after deployment. That figure reflects a combination of data archiving to Azure Cool Storage, deletion of verified ROT data Microsoft 365, and ongoing automation preventing future accumulation.
For a mid-market organisation with 500 users, M365 storage cost reduction translates to meaningful annual savings, often enough to fund adjacent IT priorities. For larger enterprises managing multiple tenants, the savings scale with the size of the estate. For a detailed five-year cost model, see How TeamsFox Eliminates Microsoft 365 Storage Waste.
Beyond cost, the operational impact is significant. IT teams report a 60% reduction in time spent on storage management tasks. Reviews that previously required manual exports and spreadsheet analysis are replaced by automated dashboards and actionable reports. Storage governance moves from reactive to proactive.
Competitors’ surface metrics. TeamsFox surfaces evidence: file-level detail, access history, size, location, and recommended action, all in one view. That is what makes the right decision possible and fast.
Conclusion
Storage costs in Microsoft 365 are growing. Most of that growth is driven by data that serves no active purpose: old files, duplicate documents, data past its useful life. Left unmanaged, this accumulation compounds quarter by quarter.
TeamsFox gives IT teams the visibility and the tools to act. File-level scanning identifies ROT data Microsoft 365 across your entire tenant. Automated archiving moves candidates to Azure Cool Storage without manual effort. Governance rules prevent accumulation from coming back.
The result is a leaner, cheaper, and more compliant Microsoft 365 estate. Organisations that manage storage actively do not just cut costs. They free up budget for the priorities that matter.
Microsoft provides controls. TeamsFox provides control: over what you store, what you pay for it, and what risk sits in your tenant right now.
About TeamsFox
TeamsFox GmbH is the Microsoft 365 management and optimisation platform trusted by organisations in 20+ countries across Europe, MENA, and Asia. From licence right-sizing to storage optimisation and governance automation, TeamsFox makes Microsoft 365 manageable at scale.