It is not clear from your comment “replaced the template” what you have done. In this sort of situation I would set the database properties so that the correct template named is referenced on the design tab. Then you should perform a Design Refresh on the database. When prompted, select the server where the template is stored. This normally would fix any design issues.
Try this with the current template version and if still a problem upgrade the database to the latest release 6 version. Of course the Notes client MUST be at the latest release before you upgrade the mail db.
You can upgrade the mail db several ways. Either use Design Replace as opposed to Refresh and select the rel 6 template. You will then need to upgrade personal folders using the Action menu option “Upgrade Folders”. Or, you can perform the upgrade from the server console via Domino Administrator using the following command:
load convert -u filepath * newtemplatefilepath
filepath = relative path (to Data folder) and file name of database e.g. mailbobjones.nsf
newtemplatefilepath = relative path and file name of template e.g. mail6.ntf
I usually use the latter method because using the -u option converts all the personal folders automatically. You should stop message delivery before running the upgrade to stop any mail being sent to the db whilst it is being upgraded using:
tell router quit
And restart message delivery after command completes using:
Mail gets queued during this time and will not be lost.
As far as creating a new database and copying documents …. well … I would suggest this should be your last choice option!