SharePoint Has Gone Read-Only? What Microsoft’s Storage Changes Mean for Your Organisation 💾
If you've suddenly started seeing warnings about SharePoint storage, or you're concerned that your SharePoint environment could become read-only, you're not alone.
Microsoft is tightening how storage limits are enforced across Microsoft 365, and organisations that exceed their allocated SharePoint storage need to take action. For organisations that have historically allowed SharePoint storage to grow beyond their allocated quota, this could mean a significant change in how their environment behaves.
And importantly, buying more storage isn't the only option. 👀
Why is Microsoft changing SharePoint storage? 🔄
Every Microsoft 365 organisation has a defined amount of SharePoint storage available to it. For non-education tenants, the standard calculation starts at 1 TB, plus additional storage based on eligible licences, with extra capacity available through additional storage purchases.
Historically, organisations may have found themselves using more storage than their allocated quota without immediately experiencing the kind of enforcement they expected. That's changing.
Microsoft's current guidance makes clear that when a SharePoint tenant exceeds its storage quota, organisations may need to purchase additional storage or reduce their storage usage, including through deletion or archiving. Microsoft also documents read-only behaviour when SharePoint is out of storage.
That means an environment that has quietly accumulated years of documents, project sites, old versions and inactive content could suddenly become a much more urgent problem.
What happens if SharePoint runs out of storage? 🚨
If your organisation exceeds its SharePoint storage quota, Microsoft states that SharePoint sites can enter read-only mode, meaning changes can't be saved.
In practical terms, that can mean users suddenly find that they can't do things they've been doing every day:
➕ Upload new documents
✏️ Edit existing content
💾 Save changes
📁 Add new files to SharePoint sites
For a business that relies heavily on SharePoint for collaboration, this isn't something you want to discover when someone is trying to upload an important document.
So... how much SharePoint storage are you actually using? 🔍
Before deciding what to do, the first step is understanding what is consuming your storage. It isn't necessarily the obvious documents. Storage can build up through:
🗂️ Old SharePoint sites and projects
📄 Inactive documents
🔄 File version history
🗑️ Recycle Bin content
👥 Sites that are no longer actively used
📚 Large document libraries
🏢 Legacy content that has simply never been reviewed
One area that's particularly easy to overlook is version history.
Option 1: Clean up unnecessary version history 🔄
One of the easiest things to overlook when investigating SharePoint storage is version history. Every time a document is changed, SharePoint can retain a previous version. Across thousands of documents - particularly large files that are edited frequently - those versions can add up to a significant amount of storage. Microsoft allows version history to be configured, so organisations don't necessarily need to retain every historical version indefinitely.
Specialised SharePoint management tools can help identify where version history is consuming the most space and remove unnecessary historical versions, without deleting the current documents themselves. This can potentially recover a significant amount of SharePoint storage without users losing the files they actually need.
It's also worth putting sensible version limits in place for the future, so the same storage problem doesn't simply build up again. The important distinction is that you're not necessarily deleting the document - you're cleaning up some of the historical copies behind it.
Option 2: Archive inactive SharePoint content 📦
For organisations with lots of data that needs to be retained but isn't actively being used, Microsoft 365 Archive can be an option. Microsoft 365 Archive provides a lower-cost storage tier for inactive SharePoint content, allowing organisations to retain data without keeping all of it in active SharePoint storage.
Microsoft now supports file-level archiving as well as site-level archiving, which gives organisations more flexibility around what they move out of active storage. This can be particularly useful for things like:
Completed projects
Historic documents
Old departmental content
Inactive files that still need to be retained
Data that may need to be accessed again, but doesn't need to be part of everyday collaboration
Microsoft 365 Archive operates on a pay-as-you-go model, with archived storage charged separately (but at a much lower cost) from active SharePoint storage.
Option 3: Clean up what you don't need 🧹
Sometimes the answer is much simpler. Your organisation may be storing data that no longer has any business value. A proper storage review can identify:
Duplicate or obsolete documents
Old versions that can be safely trimmed
Abandoned project sites
Unnecessary files
Content that has passed its retention requirements
This isn't just about reducing today's storage bill either. If your organisation doesn't have a clear approach to the lifecycle of SharePoint data, storage will simply continue growing.
Option 4: Buy more SharePoint storage 💷
Sometimes, you genuinely need more capacity. If the data is active, valuable and regularly used, moving or deleting it may make little sense. In that situation, purchasing additional storage can be the right approach.
Option 5: Move older data somewhere else ☁️
SharePoint is incredibly useful, but that doesn't mean it should automatically be the home for every piece of data your organisation has ever created. For some organisations, older or less frequently accessed data may be better suited to another storage platform or archive solution. The right answer depends on:
How frequently the data is accessed
Retention requirements
Compliance requirements
Security requirements
Cost
How quickly the data needs to be retrieved
How do you stop SharePoint storage growing indefinitely? 🔄
Getting your storage back under control solves the immediate problem. But it doesn't necessarily solve the reason you got there in the first place. If every project, document and version remains in SharePoint indefinitely, you'll eventually end up having the same conversation again.
That's why it's worth looking at the lifecycle of your SharePoint data.
A sensible approach might look something like: Create → Collaborate → Review → Archive → Delete
The aim isn't to delete data for the sake of saving storage. It's to make sure that the right data is kept in the right place for the right amount of time. That could mean setting sensible version history limits, regularly reviewing inactive sites, archiving older content and establishing clear rules around when data should be retained or removed.
Done properly, this can help prevent SharePoint becoming a permanent warehouse for everything your organisation has ever produced - and reduce the likelihood of finding yourself facing the same storage problem again.
Need help with your SharePoint storage? 🤝
If you're concerned about Microsoft's SharePoint storage changes, we're happy to help. We can review your environment, identify what's consuming your storage and help you decide what should be archived, deleted, moved or retained.
Get in touch and let's make sure your SharePoint environment is ready.
0800 640 4258