install failure upgrading exchange from 2013 to 2016

Due to replacing all systems on a site, part of this was to upgrade a exchange 2007 to 2016, due to the fact 2007 couldn't be upgraded directly to exchange 2016 we  Migrated the exchange 2007 to a temporary licenced exchange 2013 the to upgrade the 2013 copy to exchange 2016, unfortunately it seems now  when we try to upgrade the 2013 to 2016 we get a install failure has the exchange 2016 wont recognise the 2013 licence .

we are looking for a solution to solve this problem.
Alan DuckAsked:
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timgreen7077Exchange EngineerCommented:
are you attempting to run an upgrade on the actual exchange 2013 server? if that is the case you can't do that. you will need to install exchange 2016 on its own server.
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Alan DuckAuthor Commented:
the 2016 exchange is installed on a different server
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timgreen7077Exchange EngineerCommented:
The product key for Exchange 2013 and 2016 are different. You can still install Exchange 2016 and you have 180 days to use it until you get the correct product key.
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Alan DuckAuthor Commented:
true but the exchange 2013 has run passed the 180 days and now the exchange 2016 errors when it gets to the sage when it has to connect to the exchange 2013
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timgreen7077Exchange EngineerCommented:
there is no connection between the 2 server. what is the error you are getting
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Alan DuckAuthor Commented:
I Have re-run the 2016 install and I am getting the following error, File attached
exchange2016.png
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timgreen7077Exchange EngineerCommented:
make sure you have run and setup all exchange 2016 prerequisites.  see link for what must be done in advance.

https://technet.microsoft.com/en-us/library/bb691354(v=exchg.160).aspx
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IvanSystem EngineerCommented:
Hi,

the error that you receive is: Database is mandatory on Usermailbox.

That means that you have some mailbox that does not have Database (homeMDB) attribute filled.
To check, run this command: Get-Mailbox -Arbitration | Select Name, Database
If there is a mailbox with no Database, then use following command to rehome it to some database:
Set-Mailbox <mailbox_name> -Database <DB_name>

Regards,
Ivan.
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Marshal HubsEmail ConsultantCommented:
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Alan DuckAuthor Commented:
We found a number mailboxes had cruption after the Migration from exchange 2007, when we removed the cruption the exchange upgrade work fine
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