9. How to Restore Deleted Microsoft 365 Groups, Users, and Mailboxes (Video in Khmer)

Hello my friend! 😱 Oh no, admin delete wrong user or wrong group by mistake! Don't panic. Microsoft 365 keep deleted thing for some time, so you can bring it back. In this lesson have 3 video in Khmer for restore group, user, and mailbox.

What You Will Learn

✅ Restore deleted Microsoft 365 group
✅ Restore deleted user with their mailbox
✅ Keep and use mailbox of user that already deleted

How Long Microsoft 365 Keep Deleted Thing?

When you delete user or group, it not gone forever right away. It go to Deleted list first, like Recycle Bin on your computer.

What you delete	Where to find	Keep for
User (and their mailbox)	Admin center → Users → Deleted users	30 days
Microsoft 365 group	Admin center → Teams & groups → Deleted groups	30 days

After 30 days, Microsoft delete it forever. Cannot get back anymore! So restore fast.

Restore a Deleted Microsoft 365 Group (4:15)

Delete Microsoft 365 group by mistake? Learn find it in deleted group list and restore it. Member, email address, and group file come back together.

Restore a Deleted User and Mailbox (4:33)

Learn restore user from Deleted users list. When user come back, their mailbox and email come back too. Remember give license again, if user need it.

Convert the Mailbox of a Deleted User (5:17)

Staff leave company, but boss still need read their old email? Learn how to keep mailbox of deleted user and convert it, so other people can open it. Good for keep important email after staff gone.

Tips

Restore inside 30 days! After that, user or group gone forever. Don't wait.
Before delete user, think again: maybe just block sign-in is enough. Block first, delete later.
Want keep email of staff who leave? Convert mailbox to shared mailbox before delete user. Shared mailbox no need license and keep email forever.
After restore user, check license, group membership, and password again. Sometime need set again.
Restore user will fail if other user already use same email address. Change or remove that address first.
Need keep email for law or audit? Use litigation hold before delete user (see lesson 7).
Only admin can restore. So protect admin account with MFA very good.

Conclusion

Delete by mistake can happen to every admin. Now you know how to restore deleted group, user, and mailbox, and how to keep mailbox of user who leave company. Remember 30-day rule, and always think before delete. Keep learning my friend! 💡