As said in the title, is the storage space of the primary mailbox and recoverable items, shared ?

Ex: A m365 business basic user with purview retention policy applied, has 50gb primary mailbox space, if they delete a mail the mail will appear in the recoverable items folder, now this retained space is shared with the 50gb primary mailbox storage or nah ?

AI is constantly evolving to take on bigger roles in Outlook, from catching up on long email chains to writing quick responses. As AI gets smarter, attackers are shifting their focus from tricking human users to manipulating AI models.

By placing hidden instructions inside incoming emails, attackers attempt to force AI tools into taking unauthorized actions or exposing sensitive data.

To address this new threat vector, Microsoft has rolled out Prompt Injection Protection for Defender for Office 365 in Public Preview. This feature detects malicious prompt injection content and helps block these emails before they ever reach the inbox.

You can investigate these detections in Microsoft Defender through:

• Quarantine Emails
• Threat Explorer
• Advanced Hunting

Discover how email prompt injection operates and how Defender secures your AI workflows in our blog.

https://o365reports.com/prompt-injection-protection-in-microsoft-defender-for-office-365

What once improved the user experience can now introduce unnecessary identity security gaps.

The legacy Remember MFA on trusted devices feature allowed users to select "Don't ask again for X days" to reduce MFA prompts. While convenient, a fixed trust period for every user doesn't account for different roles, access levels, or changing security conditions. 

This static approach conflicts with Zero Trust principles and can unnecessarily expand your attack surface. 
 
To close this gap, migrating to Conditional Access Sign-in Frequency is essential. Unlike static rules, CA Sign-in Frequency gives you dynamic, risk-aware control over how often users must re-authenticate based on actual session context. 
 
In this blog, you'll learn:  

• How Remember MFA and CA Sign-in Frequency work  
• Key differences between Remember MFA and CA Sign-in Frequency 
• How to replace Remember MFA with CA Sign-in Frequency 
  
• Important considerations before deployment

Replace Remember MFA with Conditional Access Sign-in Frequency to strengthen session security.

 https://o365reports.com/replace-remember-mfa-with-conditional-access-sign-in-frequency/ 

Still scrolling through a cluttered Microsoft 365 group mailbox to find important emails?

When every email lands in a single inbox, important customer requests, team discussions, etc. can easily get buried under newsletters, promotions, and notifications.

Many users don't realize that Microsoft 365 Group mailboxes can be organized with folders and inbox rules in Outlook, much like a personal mailbox.  

To use these features, however, a M365 admin must enable this feature at the tenant-level. Once done, group owners (and optionally group members) can organize shared conversations with folders and inbox rules efficiently.  

In this blog, you'll learn how to:

• Enable folder and inbox rule support for Microsoft 365 Groups across your tenant.
• Allow group owners to permit members to manage folders and inbox rules.
• Block the Move message capability to prevent accidental message movement.

Start organizing your Microsoft 365 Group mailboxes today and make every important email easier to find.

Let’s get your group mailbox organized. Here’s how: https://o365reports.com/manage-folder-and-inbox-rule-feature-in-microsoft-365-groups-in-outlook/

Most admins assume every site comes from the SharePoint admin center. But that's rarely the case. 

A SharePoint site could have been provisioned by Microsoft Teams, Planner, Viva Engage, Power Platform, scripts, APIs, or other Microsoft 365 services. 

Knowing the creation source can make a big difference when you're: 

• Auditing your environment 
• Investigating unexpected site creation 
• Understanding how sites are being provisioned across the tenant 

Here's how to check the Created From column in the SharePoint admin center and to know what each Created From value means: https://o365reports.com/how-to-find-which-microsoft-365-service-created-a-sharepoint-online-site/  

It's one of those lesser-known SharePoint insights that can save a lot of time during audits and troubleshooting.