In recent history, Microsoft quietly supported 1TB to 5TB. Many customers didn’t notice that change. Many Office 365 Admins don’t realize the limit is NOT 1TB. This quiet update to the pricing plans with the reference to unlimited storage with the little circled i with more information has not really made it to general mindset of the community and many customers still support competing products not realizing that OneDrive as well supports UNLIMITED STORAGE for users! A simple search for OneDrive Unlimited results in old information no recent discussions.
Why would you not want 25TB quotas for your users especially those who refuse to move because there isn’t enough cloud storage or they are worried about the cost? OneDrive just got 25x more cool and beyond!
I put together the very sharable infographic above, so you can help promote the fact that OneDrive for Business is now Unlimited. Feel free to use the image how every you’d like feel free to download it or use it in your slides.
Download the OneDrive Unlimited Storage Infographic.
It’s not hard to give all your users 5TB of storage by default. Simply go to https://admin.onedrive.com/?v=StorageSettings and change the default 1TB to 5TB
Or through the Office 365 Admin Powershell:
To change default quota to 5TB for OneDrive for Business for entire Tenant
Set-SPOTenant -OneDriveStorageQuota 5120
Set-SPOSite -Identity <user’s OneDrive URL> -StorageQuota <quota>
Note Subscriptions with less than five users receive 1 TB of personal cloud storage per user. In fact all start that way.
“Customers will initially be provisioned 1 TB of personal cloud storage per user in OneDrive for Business. You may increase the default OneDrive for Business storage space to up to 5 TB per user with the help of your Office 365 administrator once the 1TB quota is 90% full.”
Thats the tricky part. Microsoft is basically saying wait until a user has reached that capacity, but getting to 5 TB default you don’t need to wait, but going to 25 TB quotas you’ll need MS support help with justification such as a user who is close.
“Whenever you need cloud storage beyond the initial 5 TB, open a case with Microsoft technical support to request it. Additional cloud storage will be granted as follows:
- When a user has filled their 5 TB of OneDrive for Business storage to at least 90% capacity, Microsoft will increase your default storage space in OneDrive for Business to up to 25 TB per user (admins may set a lower per user limit if they wish to).
- For any user that reaches at least 90% capacity of their 25 TB of OneDrive for Business storage, additional cloud storage will be provided as 25 TB SharePoint team sites to individual users. This additional storage is provided to the tenant by way of credit.
To see how much personal cloud storage you are using, your Office 365 administrator can go to the OneDrive Admin Center to manage their users’ personal cloud storage.”
See Change your users’ OneDrive storage space using PowerShell for more information on how Office 365 administrators can manage user storage in OneDrive for Business.
I had heard rumors that the 15GB per file limit was increased. I have not seen this play out. Uploading a file of 15.1 GB failed. I confirmed 15GB max individual file is still the case. I’m hoping to see this increased for video files. 
You can determine your personal quota by navigating to your onedrive for business and appending /_layouts/15/storman.aspx?root=Documents It’s also in site settings… look for Storage Manager. The nick name was StorMan
References:
https://docs.microsoft.com/en-us/onedrive/set-default-storage-space
https://docs.microsoft.com/en-us/onedrive/change-user-storage
https://products.office.com/en-us/onedrive-for-business/compare-onedrive-for-business-plans
https://products.office.com/en-us/business/compare-more-office-365-for-business-plans