Fixing old DAGs after migrating to O365

One of the other admins here was tasked with decommissioning our on-prem DAG and Exchange 2010 servers after moving to O365. Unfortunately, he just uninstalled the Exchange server software on the servers and turned them off. This left quite a mess with the Multiple DAGs and Databases.

I'm trying to clean this up so that I can manage exchange properties in our Azure AD.

Can anyone gives me an idea on how to fix this mess? Below is the status of our databases.

[PS] C:\Windows\system32>Get-MailboxDatabaseCopyStatus *

Name                                          Status          CopyQueue ReplayQueue LastInspectedLogTime   ContentIn
                                                              Length    Length                             State
----                                          ------          --------- ----------- --------------------   ---------
DB1\CAPH-EXCHMBX3                             Dismounted      0         0                                  Failed
DB2\CAPH-EXCHMBX3                             Dismounted      0         0                                  Failed
DB3\CAPH-EXCHMBX3                             Dismounted      0         0                                  Failed
DB4\CAPH-EXCHMBX3                             Dismounted      0         0                                  Failed
DB5\CAPH-EXCHMBX3                             Dismounted      0         0                                  Failed
Archive\CAPH-EXCHMBX3                         Dismounted      0         0                                  Failed
DB6\CAPH-EXCHMBX3                             Dismounted      0         0                                  Failed
DB2\CAPH-EXCHMBX4                             ServiceDown     0         0                                  Unknown
DB3\CAPH-EXCHMBX4                             ServiceDown     0         0                                  Unknown
DB6\CAPH-EXCHMBX4                             ServiceDown     0         0                                  Unknown
Archive\CAPH-EXCHMBX4                         ServiceDown     0         0                                  Unknown
DB5\CAPH-EXCHMBX4                             ServiceDown     0         0                                  Unknown
EXDB1\CAPH-EXMAIL1                            FailedAndSus... 35152     0           2/9/2018 7:30:15 PM    6
EXArchive\CAPH-EXMAIL1                        Mounted         0         0                                  Healthy
EXDB2\CAPH-EXMAIL1                            Mounted         0         0                                  Healthy
EXDB3\CAPH-EXMAIL1                            Mounted         0         0                                  Healthy
EXDB4\CAPH-EXMAIL1                            Mounted         0         0                                  Healthy
EXDB5\CAPH-EXMAIL1                            Mounted         0         0                                  Healthy
EXDB6\CAPH-EXMAIL1                            FailedAndSus... 33948     0           2/9/2018 7:30:15 PM    6
EXDB1\CAPH-EXMAIL2                            Mounted         0         0                                  Healthy
EXArchive\CAPH-EXMAIL2                        Healthy         0         0           12/17/2018 7:40:07 AM  Healthy
EXDB2\CAPH-EXMAIL2                            Healthy         0         0           12/17/2018 7:41:44 AM  Healthy
EXDB3\CAPH-EXMAIL2                            Healthy         0         0           12/17/2018 7:41:23 AM  Healthy
EXDB4\CAPH-EXMAIL2                            Healthy         0         0           12/17/2018 7:31:48 AM  Healthy
EXDB5\CAPH-EXMAIL2                            Healthy         0         0           12/17/2018 7:41:34 AM  Healthy
EXDB6\CAPH-EXMAIL2                            Mounted         0         0                                  Healthy
EXArchive\BDR-EXMAIL1                         ServiceDown     0         0                                  Unknown
EXDB1\BDR-EXMAIL1                             ServiceDown     0         0                                  Unknown
EXDB2\BDR-EXMAIL1                             ServiceDown     0         0                                  Unknown
EXDB3\BDR-EXMAIL1                             ServiceDown     0         0                                  Unknown
EXDB4\BDR-EXMAIL1                             ServiceDown     0         0                                  Unknown
EXDB5\BDR-EXMAIL1                             ServiceDown     0         0                                  Unknown
EXDB6\BDR-EXMAIL1                             ServiceDown     0         0                                  Unknown

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Jacob DurhamIT Support Analyst II (Lead Infrastructure Engineer)Asked:
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MaheshArchitectCommented:
how many exchange servers do you have?

1st you need to turn on all of them and if already all mailboxes are migrated to o365, then delete passive database copies

after that remove active database copies, remove DAG
Jacob DurhamIT Support Analyst II (Lead Infrastructure Engineer)Author Commented:
We had about 6. I was able to delete most of the passive copies.

How do you remove the active copies?
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MaheshArchitectCommented:
once you remove all passive copies from server, remove server from DAG, active copies in DAG will remain local on server, if all mailboxes are moved to O365 fro given active database, then check active databases one by one for any arbitration mailboxes, if found move them to any one active mailbox database and delete rest empty mailbox databases one by one from EMC /EMS
Jacob DurhamIT Support Analyst II (Lead Infrastructure Engineer)Author Commented:
Ok - I finally got them all to remove and uninstalled.

Is it possible to install 2016 on-prem for user management and add it into the o365 hybrid deployment?
AmitIT ArchitectCommented:
Did you removed all Exchange 2010 servers or you sill have anyone left, if your Exchange org is gone, then you need to install Exchange 2016 as fresh with new org name. If 2010 still present, then you need to do the Exchange migration.
Jacob DurhamIT Support Analyst II (Lead Infrastructure Engineer)Author Commented:
I removed them all. They were all corrupted and broken. I've migrated everyone to the o365 cloud.

I'm deploying an new 2012 DC server for a clean 2016 install. What do you mean a fresh org name?
CHI-LTDCommented:
exchange organisation name i believe
MaheshArchitectCommented:
Yes, that is correct

navigate to CN=services,cn=configuration,DC=domain,DC=com and locate exchange server container and check if exchange org is still exists, if exchange is removed properly, it should get removed

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CHI-LTDCommented:
Would EXBPA not help here?
AmitIT ArchitectCommented:
I am referring to Exchange organization. Whenever you setup new Exchange environment, it creates an Exchange org. Per forest you can only have, one Exchange org. If you removed the current org, then you need to recreate new one.
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