Transfer account from centova 2.6 to centova 3

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Hi guys,
Is there any automated way to transfer account from centova 2.6 to centova 3.

If there is no such thing can someone share some easy or maybe the easiest way to do that manually ?

Im thinking of many ways but my main problem is the database so im asking you :)
When they release version 3.0 Final they will also release an upgrade tool to migrate your accounts.
I need to move my current accounts to new server because the recources of my are almost 100%. Perhaps i will install 2.6 but do i need to reinstall OS again or it there will be upgrade of 2.6  to 3.0 or just some service which transfer accounts from 2.6 to 3.0 ?