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Old legacy systemmailbox in Exchange - how to delete

Dear Experts

I will perform Exchange 2010 to 2016 migration and now I setup everything in virtual environment so that I can try procedures and processes before performing migration on real databases.

During migration, after migrating all user mailboxes and systemmailboxes, I found one SYSTEMMAILBOX - legacy - which is listed normally among user mailboxes and which is displayed with warning - "object has been corrupted ...... Database is mandatory on UserMailbox"

My machine was originally running Exchange 2003 as Small Business Server and later it was upgraded to Exchange 2010. I suspect that this system mailbox is simply kind of remnant from prehistoric times of 2003 server. I can remember that transition from 2003 to 2010 was not easy.

So I just want to delete it, but what I try to do it from E16 where I can see mailbox among users, I get and error (see picture 5) and when I go to E10 I cannot see that mailbox among users at all so I cannot try to delete.

Any advice please?

Thanks

Vladimir
2019-10-17_9-45-03-Picture1.jpg
2019-10-17_9-45-27-Picture2.jpg
2019-10-17_9-47-15-Picture3.jpg
2019-10-17_9-47-43-Picture4.jpg
2019-10-17_9-57-13-Picture5.jpg

Saif Shaikh

Remove the orphaned arbitration mailboxes using ADSIDIT or

AD Users and Computers:
DELETE the following users in the “Users” container:

DiscoverySearch Mailbox{GUID}
Exchange Online-ApplicationAccount
FederatedEmail.GUID
Migration.GUID
*SystemMailbox{GUID}
*HealthMailboxGUID

ASKER CERTIFIED SOLUTION

Saif Shaikh

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M A

Set the database

Get-Mailbox -Arbitration | Set-Mailbox -Arbitration -Database "NewDatabase"

Open in new window

And make sure databse is correct

Get-Mailbox -Arbitration | ft Name, ServerName, Database -Auto

Open in new window

if not solved you can delete that systemmailbox and recreate it by running
Setup /preparead /IAcceptExchangeServerLicenseTerms
https://docs.microsoft.com/en-us/exchange/recreating-arbitration-mailboxes-exchange-2013-help

Vladimir Buzalka

ASKER

HI, I have deleted all mailboxes from users container as adviced in first advice. but I could not find there my legacy one :-)

So i wanted to follow up your 2nd advice but I do not see MS Exchange System Objects under AD Users and Computers, can you let me know?

Thanks

V

Saif Shaikh

Click on the advanced filter at the top in AD users and computers.

Then you will see it.

Saif Shaikh

To enable advanced functionality in Active Directory Users and Computers go to the View menu and select Advanced Features.

Saif Shaikh

Open Active Directory Users and Computers. For example:

Press Windows key + R, enter dsc.msc, and then click OK.

In Administrative Tools > Active Directory Users and Computers.

In the Active Directory Users and Computers, click View > Advanced Features.

See attached.

Locate the Microsoft Exchange System Objects container.
ExchangeSystemObject.jpg