Can I delete these SystemMailbox from Exchange? They say legacy and have multiple warnings

Hello
I am trying to wrap up a migration from Exchange 2010 to 2016.  I tried to remove an old BES throttling policy and it complains about still being associated with these mailboxes.  I had noticed them before in the Exchange Admin Center but had ignored them up to now.  What you can see in the Admin Center is they do not have any databases associated with them.  I found the ID's in Active Directory under the Microsoft Exchange System Objects container and they show as disabled.
So my question is... can I delete these safely without destroying my Exchange environment!?
Thanks
Phil
Phil BaileyAsked:
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FOXActive Directory/Exchange EngineerCommented:
Please refer to this link to remove the throttling policy from your Exchange 2010 environment

ref link: http://ivan.dretvic.com/2012/09/how-to-decomission-blackberry-enterprise-server-express-5-0-from-our-exchange-2010-environment/

scroll down to -  EDIT: Following Section Added – Thanks to Oliver Weber for pointing out
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Phil BaileyAuthor Commented:
Mine is called BESPolicy also.  How would you run that script?  Save it as a .ps1 file and just run it?  Safe to run during the day?
What about the SystemMailbox - should I delete those afterwards?
Thanks
Phil
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Phil BaileyAuthor Commented:
I just ran the script.  There are no mailboxes with the  BESPolicy assigned.  Now what do I do about the SystemMailboxes with the warnings?
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FOXActive Directory/Exchange EngineerCommented:
If you ran the whole script it would have checked to see if it was associated to any mailboxes and then the last line was to delete the policy itself.  Was the policy deleted?
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FOXActive Directory/Exchange EngineerCommented:
Breeze through this link which has post migration steps

ref link:  http://blog.ollischer.com/exchange-2016-migration-finishing-touches-post-migration-tasks
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Phil BaileyAuthor Commented:
Hello
I have completed most of those steps and my system mailboxes have all been moved to 2016.  These appear to be random strange leftover mailboxes.  I just wondered if anyone has ever seen them before and what  the best way to delete is?
Thanks
Phil
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FOXActive Directory/Exchange EngineerCommented:
Please upload a screenshot of said mailboxes
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Phil BaileyAuthor Commented:
I though I did on the original post.  Will try again. systemMailboxErrors.png
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FOXActive Directory/Exchange EngineerCommented:
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Phil BaileyAuthor Commented:
Yes, I already migrated those.   The names appear to be different.  

[PS] C:\pfscripts>Get-Mailbox -Arbitration | fl Name


Name : SystemMailbox{1f05a927-ffc5-4cb6-a441-600e725a1ed4}

Name : SystemMailbox{e0dc1c29-89c3-4034-b678-e6c29d823ed9}

Name : FederatedEmail.4c1f4d8b-8179-4148-93bf-00a95fa1e042

Name : SystemMailbox{bb558c35-97f1-4cb9-8ff7-d53741dc928c}

Name : Migration.8f3e7716-2011-43e4-96b1-aba62d229136

Name : SystemMailbox{D0E409A0-AF9B-4720-92FE-AAC869B0D201}

Name : SystemMailbox{2CE34405-31BE-455D-89D7-A7C7DA7A0DAA}
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FOXActive Directory/Exchange EngineerCommented:
I believe you are good to go.  If they are already disabled, if they are not tied to any database they can be deleted.
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Phil BaileyAuthor Commented:
Ok, just deleted them from AD.  We will give it 24 hours to see what happens!!
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Phil BaileyAuthor Commented:
No issues so far since deleting.  Thank you.
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FOXActive Directory/Exchange EngineerCommented:
Nice!!
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