Database object cannot be located

We have just updgraded our servers to domino 8.5. We have retained the same clients i.e. 6.5.4.We are encountering certain instances were users are prompted with the following error message.

'Database object cannot be located’when opening their mail files.

Any help will do?

Subject: Update the Template

I would highly recommend that you first upgrade both the template and ODS of the users to template mail85.ntf and ODS 51 by running the following on the " Server Console"

Load convert mail * mail85.nsf

load compact -c mail

Secondly, I recommend an upgrade of the client to Lotus Notes8.5

Hopefully this is Helpfull

Subject: Template

Your mail template should not be higher than the client version, keep it at R6

Subject: ODS…

Hi Ahmad,we have decided to retain the same cleint for the moment i.e. 6.5.

Question: Can the ODS be changed without upgrading the templates?

Subject: Yes, you can upgrade the ODS

I’ve got people on 6.5.4 templates but with the latest ODS and not seeing any issues.