Deleted email has a short life
Exchange Online keeps deleted items recoverable for 14 days by default, extendable to 30.
Source: Microsoft

Microsoft runs the service, but under its shared responsibility model your data is yours to protect. Deleted items and recycle bins have time limits. Independent backup covers accidental deletion, ransomware and departed staff.
Exchange Online, OneDrive, SharePoint and Teams backed up outside your tenant.
Retention set to your regulatory, contractual and client requirements, not Microsoft's defaults.
Immutable copies that an attacker with admin access cannot delete.
Mailboxes and files of departed staff kept without paying for a licence.
Restores tested on a schedule, with results recorded.
Data, retention needs and risks reviewed.
Backup and retention set up.
Restores tested and documented.
Daily checks and regular reporting.
Exchange Online keeps deleted items recoverable for 14 days by default, extendable to 30.
Source: Microsoft
SharePoint and OneDrive recycle bins keep files for 93 days. After that, without a backup, they are gone.
Source: Microsoft
Microsoft protects the service against its own failures. Recovering from your own deletions, ransomware or a departed user's lost files is your responsibility.
As long as your regulatory, contractual and client obligations require. We help you set it.
Yes. Good Microsoft 365 backup restores individual items as well as whole mailboxes and sites.
Tell us what you're working on. We'll listen, ask the right questions and recommend a practical next step. No obligation.