How to re-enable inactive mailbox from litigation hold in exchange online using Power Shell(Manual)

When users leave the company you might want to retain the email for a longer period than the default 30 days. By enabling litigation hold you can retain mailboxes longer than 30 days, before you disable a user you can set the litigation hold to any value you would like. But at some point you might need the mailbox to be re-enabled for some reason. In this manual I am going to explain how to do it.

STEP 1: Open a new Power Shell window and type the following command

Import-Module ExchangeOnlineManagement
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Find inactive mailboxes in Exchange Online

So you want to clean up unused (shared) mailboxes in your Exchange (Online) environment. How to find out which mailboxes have been inactive for a long time? The answer is yet simple again, with a cool Power Shell script.

Afbeeldingsresultaat voor exchange mailbox delete"

First we will connect to Exchange Online

$Credential = Get-Credential
$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://outlook.office365.com/powershell-liveid/ -Credential $Credential -Authentication Basic -AllowRedirection
Import-PSSession $Session
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How to solve Failed to sync the ArchiveGuid in Office 365 (Manual)

Last few weeks I’ve been struggling with an very difficult Office 365 / Exchange Online case, that got escalated to multiple Microsoft departments to be fixed. I already found one part of the solution, but Microsoft found the second part. Today I would like to take you through all the steps to fix possible causes and resolutions. So the initial problem started with the following error in the Office 365 admin portal with the affected users:

Failed to sync the ArchiveGuid 00000000-0000-0000-0000-000000000000 of mailbox MailboxGuid because one cloud archive CloudArchiveGuid exists.

Another symptom is the mailbox provisioning gets stuck, and hangs on “We are preparing a mailbox for this user”

You will only see this error with AD connect sync enabled environments. The problem occurs when the on-premise value mismatches with the Online Archive Guid. With just a few easy steps we can fix this issue.

Resolution

We will need to fill multiple Active Directory user attributes to resolve this issue.

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