Migrate clients from Exchange 2013 to a different Exchange 2013

Hi,
We are planning to migrate an Exchange 2013 instance to a centralized one. The question is how to deal with the Outlook OST mail files left over from the old instance and were wondering what best practices in this regard there may be.
Thanks in advance for any advice you can provide.

Hi,
Do you mean you want to migrate mailbox from one Exchange server to another Exchange server? If it is, we can directly move the whole mailbox to another mailbox server instead of Exporting/Importing a mailbox to PST file.
If you want to migrate a large number of user mailboxes, we can
specify a CSV file when you use the Exchange admin center (EAC) or the New-MigrationBatch cmdlet in the Exchange Management Shell to create a migration batch.
Here are some detailed information about mailbox moves in Exchange 2013:
http://technet.microsoft.com/en-us/library/dn170437(v=exchg.150).aspx
Move Mailbox in Exchange Server 2013
http://msexchangeteam.in/move-mailbox-in-exchange-server-2013/
Note: Microsoft is providing this information as a convenience to you. The sites are not controlled by Microsoft. Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. Please
make sure that you completely understand the risk before retrieving any suggestions from the above link.
Thanks,
Winnie Liang
TechNet Community Support

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Hello Gadget,
Please find the solution as follows
This error is concern about WMSVC certificate which was deleted, we could refer to the following steps:
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https://social.technet.microsoft.com/Forums/office/en-US/eac00dc2-6e43-45ae-939c-aad82a144908/cu8-install-fails?forum=exchangesvrgeneral
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Migrate clients from Exchange 2013 to a different Exchange 2013

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