question

BKITStaff-2336 avatar image
0 Votes"
BKITStaff-2336 asked ·

Exchange migration - Arbitration mailbox(es) to be moved

Hello, I'm upgrading (migrating) my Exchange environment from Exchange 2010 to 2013 (staging migration, until we will have budget for Exchange 2022 licenses next year). I need to move, as stated on both Technet and Deployment Assistant, the System mailbox(es). The question is: which Arbitration/System mailboxes do have to be moved? As per Technet/Deplyment Assistant it is just the one named "SystemMailbox{e0dc1c29-89c3-4034-b678-e6c29d823ed9}", but in many others tutorials it's said to move all the arbitration mailboxes. From my Exchange, by querying for Arbitration mailboxes, I get:

 [PS] C:\>Get-Mailbox -Arbitration | fl name, displayname, database, admindisplayversion
    
    
 Name                : SystemMailbox{1f05a927-608a-45a6-bf83-467dc6314b2e}
 DisplayName         : Approvazione guidata di Microsoft Exchange
 Database            : Mailbox Database 1250618726
 AdminDisplayVersion : Version 14.3 (Build 123.4)
    
 Name                : SystemMailbox{e0dc1c29-89c3-4034-b678-e6c29d823ed9}
 DisplayName         : Microsoft Exchange
 Database            : Mailbox Database 1250618726
 AdminDisplayVersion : Version 14.3 (Build 123.4)
    
 Name                : FederatedEmail.4c1f4d8b-8179-4148-93bf-00a95fa1e042
 DisplayName         : Microsoft Exchange Federation Mailbox
 Database            : Mailbox Database 1250618726
 AdminDisplayVersion : Version 14.3 (Build 123.4)
    
 Name                : SystemMailbox{bb558c35-97f1-4cb9-8ff7-d53741dc928c}
 DisplayName         : Microsoft Exchange
 Database            : Mailbox Database 1 2013
 AdminDisplayVersion : Version 15.0 (Build 1497.2)
    
 Name                : Migration.8f3e7716-2011-43e4-96b1-aba62d229136
 DisplayName         : Microsoft Exchange Migration
 Database            : Mailbox Database 1 2013
 AdminDisplayVersion : Version 15.0 (Build 1497.2)



Do I have to migrate just the one reported on Technet or all the arbitration mailboxes as stated on many other places (here and here for example)?

Thank you,
Francesco B. B.


office-exchange-server-deployment
10 |1000 characters needed characters left characters exceeded

Up to 10 attachments (including images) can be used with a maximum of 3.0 MiB each and 30.0 MiB total.

AndyDavid avatar image
1 Vote"
AndyDavid answered ·

Move them all

 get-mailbox -arbitration | new-moverequest -targetdatabase <NewDB>

· 1 ·
10 |1000 characters needed characters left characters exceeded

Up to 10 attachments (including images) can be used with a maximum of 3.0 MiB each and 30.0 MiB total.

Why, if I can ask? Does something get broken if I move just the one mentioned on technet/deployment assistant? I like to understand things a bit more beyond the "do this way"... :) Wondering why that discrepancy. Thank you.

0 Votes 0 ·
AndyDavid avatar image
1 Vote"
AndyDavid answered ·

During migration, the sooner you move them the better. Often if arbitration mailboxes are on an older version, some processes handled by the newer version of Exchange may not work so well:

https://blog.rmilne.ca/2016/09/15/when-to-move-arbitration-mailboxes/

When To Move
The above discussion unpacks the history and reason why arbitration mailboxes are often found in the above situation. However this should not be the case.

Arbitration mailboxes must be moved at the beginning of the project, before moving user mailboxes onto the new version of Exchange. It is expected and required that the arbitration mailboxes are moved to the latest version of exchange unless a specific article discusses an issue.

If you fail to do this simple step, then big issues are heading your way. They include:

Administrator actions are not saved to the administrator audit log
Cannot run E-Discovery searches
Unified Messaging prompts may not function as expected





https://blog.rmilne.ca/2018/03/19/arbitration-mailboxes-lay-of-the-land/


·
10 |1000 characters needed characters left characters exceeded

Up to 10 attachments (including images) can be used with a maximum of 3.0 MiB each and 30.0 MiB total.

KaelYao-MSFT avatar image
1 Vote"
KaelYao-MSFT answered ·

Hi, @BKITStaff-2336
The function of the arbitration mailboxes is introduced in this document: Recreating arbitration mailboxes
74003-56.png

If you only move the arbitration mailbox "SystemMailbox{e0dc1c29-89c3-4034-b678-e6c29d823ed9}", I suppose that later you may run into trouble with migrating mailboxes and OAB generation.


If the response is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.


56.png (67.4 KiB)
·
10 |1000 characters needed characters left characters exceeded

Up to 10 attachments (including images) can be used with a maximum of 3.0 MiB each and 30.0 MiB total.

BKITStaff-2336 avatar image
0 Votes"
BKITStaff-2336 answered ·

Thank you all guys, @KaelYao-MSFT and @AndyDavid, for the detailed answers and links (I eagerly read them). I also saved in my boormarks Rhoderick Milne blog. Great!

I just wonder why Technet doumentation and Exchange Deploy Assistant instruct to move just the "SystemMailbox{e0dc1c29-89c3-4034-b678-e6c29d823ed9}" arbitration mailbox and not all the arbitration mailboxes. I don't think Microsoft wants customer Exchange installations to get broken. Is there any reason for it?

Again, thank you!
Francesco B. B.

· 4 ·
10 |1000 characters needed characters left characters exceeded

Up to 10 attachments (including images) can be used with a maximum of 3.0 MiB each and 30.0 MiB total.

Hi,
As mentioned in https://blog.rmilne.ca/2018/03/19/arbitration-mailboxes-lay-of-the-land,
the SystemMailbox{bb558c35-97f1-4cb9-8ff7-d53741dc928c} is added in Exchange 2013 for OAB generation.
In Exchange server 2010, OAB generation was on server-level.
While in Exchange server 2013, it is on organization-level,generated by organization mailbox(SystemMailbox{bb558c35-97f1-4cb9-8ff7-d53741dc928c}).
Here is a blog for your reference: OAB in Exchange Server 2013

And the Migration.8f3e7716-2011-43e4-96b1-aba62d229136 is also added in Exchange 2013.

Since the Technet documentation applies to Exchange 2010, which doesn't have these two arbitration mailboxes, it doesn't contain the two mailboxes.
If you are migrating from Exchange 2013 to Exchange 2016 or 2019, you can see it is mentioned in the Exchange Deploy Assistant to move all the arbitration mailboxes.

1 Vote 1 ·

@KaelYao-MSFT Hence, in my specific case 2010 -> 2013, is it better to move just the "SystemMailbox{e0dc1c29-89c3-4034-b678-e6c29d823ed9}" arbitration mailbox? Whereas, for future migrations , I'll have to move all the arbitration mailboxes. Correct?

Thanks,
Francesco B. B.

0 Votes 0 ·

No, thats not what is being said. You need to move all of them to the new version :)
Its very safe and it may not be mentioned in older documentation for older versions

Trust me :)

1 Vote 1 ·
Show more comments