BO 3.1 to 4.1 Upgrade: Local WebI Reports

Hi all,

I would like to know what is the best strategy to upgrade (from BOE 3.1 to BI 4.1) WebI reports stored locally on the user's machines.

It is necessary to load them into the BI Platform so that we can upgrade them too or it can be sufficient to change the source of the webi report once the upgrade of the universe in the new platform has been done?

Or there is another possible solution ?

Thanks,

Michele