Default Policy cannot be managed by the current version of Exchange Management Console

Hi 

I have a problem modifying exchange 2013 default email address policies after removing an old exchange 2003 server.

I probably forgot to remove the mailbox manager policy from the old server and find myself in a situation where I want to modify the default email address policy using ECP in exchange 2013.

I was trying to add another email address format and set it as the default reply email address and I got this error:

  

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Error:
The object ?Default Policy?cannot be managed by the current version of Exchange Management Console, please use a management console with the same version as the object ?0.0 (6.5.6500.0)? 
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I followed the following article using adsiedit.msc:

https://goo.gl/r5aaRI

But there are no EC entries in my MsExchPolicyOptionList value and MsExchMailboxManagerFolderSettings attibute is not set.

Can't get past this error.

Any ideas? I am desperate.

Is there a way to remove the current default email address policy and create a new deault one?
Or can I change the GatewayProxy value to the one I want setup?

Thanks and regards

Alfred56