Hello guys,
We have exchange 2007 SP3 servers, Exchange 2013 CU3 with all
rules (no DAG) server and Office 365 .
Exchange 2013 CU3 servers were
installed initially only for office 365 migration needs. They configured as
hybrid servers.
No, after the migration I would like to install Exchange 2013
servers with DAG.

I am going to install 2 new servers with only Mailbox
role on Windows 2008 R2 enterprise.
Also, I will upgrade current Exchange
2013 CU3 to CU7.
Later after making sure everything is ok, I am planning to
remove mailbox role from these hybrid servers. Unfortunately, in order to do it,
exchange should be removed and re-installed with only client rule.
Will it
remove or change significantly hybrid configuration? Is there any manual how to
remove\reinstall exchange without changing hybrid config?

Second question: Are any issues with CU7 and it's better to stay with CU3? I prefer to upgrade since all the users who still not migrated to Office 365, are located on Exchange 2007. So it will be easier to do it now than later after migration

Please assist

I recommend that you just leave the mailbox role on the servers.  You don't have to have a mailbox database on the server.

Hi,

According to your description, I want to double confirm the deployment you wanted, as below:
Current environment:
Exchange 2007 SP3 server
One Exchange 2013 CU3 server with all role
Office 365

After change:
Previous Exchange 2007 SP3 server ----> Exchange 2007 only CAS role
Previous Exchange 2013 CU3 server with all role ----> Exchange 2013 only CAS role
New two Exchange 2013 MBX role with DAG
Office 365
If I misunderstand your concern, please do not hesitate to let me know.

If you have completed move all mailbox from previous Exchange 2007 and Exchange 2013 to new Exchange 2013 MBX server with DAG, theres no need to retain Exchange 2007 in your environment, also multi DNS record and legacy virtual directory settings. Besides, we can remove mailbox role from computer which install Exchange server 2007. For you reference:
https://technet.microsoft.com/en-us/library/bb124115(v=exchg.80).aspx
However, uninstalling individual roles isnt supported in Exchange 2013. When you uninstall Exchange 2013, all server roles are uninstalled from the computer. As Ed mentioned, we can retain MBX role, move all mailbox database to new server then remove database.

For your second question, Cumulative Update 7 for Microsoft Exchange Server 2013 has been released for a long time, and it became more stable.
More details about Cumulative Update 7 for Exchange Server 2013, please refer to:
https://support.microsoft.com/en-us/kb/2986485?w=wsignin1.0

Allen,

I uninstalled exchange and installed only client role on two servers and updated deleted settings on virtual directories. Needed to recreate arbitration mailbox and OAB. Everything is ok. hybrid config was not touched since I uninstalled exchange and reinstalled it on servers one by one.

I configured WNLB for two client servers and configured its VIP hostname on outlook anywheree configuration- it's working. Since it's better to configure load balance with layer 7 and not 4, I will wait for F5 guy to create related VIP for me.

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• Edited by Exchange Admin 365 11 hours 14 minutes ago