How to recover deleted mailbox office 365 after 30 days?

Recovering a deleted mailbox in Office 365 after 30 days can be challenging, but there are a few things you can try:

1. Use Exchange Online PowerShell: You can use PowerShell to recover the deleted mailbox if it still exists in the Office 365 recycle bin. Here are the steps:

• Connect to Exchange Online PowerShell using your admin credentials.
• Run the following command to check if the mailbox is still in the recycle bin:

Get-Mailbox -InactiveMailboxOnly -Identity <MailboxName>

• If the mailbox is found, run the following command to restore it:

New-MailboxRestoreRequest -SourceMailbox <MailboxName> -TargetMailbox <NewMailboxName> -AllowLegacyDNMismatch

2. Check with Microsoft Support: If the mailbox is not in the recycle bin, you can contact Microsoft support to check if they can recover the mailbox from their backups.
3. Use a Third-Party Tool: There are third-party tools available that can recover deleted Office 365 mailboxes. You can do some research and choose a reliable tool that meets your needs.

Note: It’s always recommended to have a backup strategy in place to avoid data loss. Office 365 has built-in backup options, and you can also use third-party backup solutions to protect your data.