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Hi.<br />
I remember years ago some kind of issues when which finished the migration from exchange 5.5 to exchange 2003 and from NT 4 to Windows server 2003. The problems arise cause the connector between the two domains failed and exchange server 5.5 never was remove as should have been.<br />
<br />
After that we rise the domain, the forest level and exchange to native mode.<br />
Now I'm having an issue when trying to add a distribution list as contributor to a public folder.<br />
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The exact error is this Event ID 9556<br />

<pre><code id="code-10-27654498-1">Unable to set permission for DL /o=OLD INSTITUTION NAME/ou=NEW INSTITUTION NAME/cn=Recipients/cn=DASNT because it could not be converted to a security group. This most likely is because your system is in a mixed domain. </code></pre>
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I also get the warning Event ID 1233<br />
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<pre><code id="code-10-27654498-2">An error occurred.
 Function name or description of problem: EcCvtDLToSecGrp
Error: 0x8004010f </code></pre>
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So, what can I do to force the native mode. Right Now exchange said that is already on Native mode
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Hi.
I remember years ago some kind of issues when which finished the migration from exchange 5.5 to exchange 2003 and from NT 4 to Windows server 2003. The problems arise cause the connector between the two domains failed and exchange server 5.5 never was remove as should have been.

After that we rise the domain, the forest level and exchange to native mode.
Now I'm having an issue when trying to add a distribution list as contributor to a public folder.

The exact error is this Event ID 9556
(CODE)

I also get the warning Event ID 1233

(CODE)

So, what can I do to force the native mode. Right Now exchange said that is already on Native mode

Force Exchange 2003 Native Mode

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Windows Server 2003 was based on Windows XP and was released in four editions: Web, Standard, Enterprise and Datacenter. It also had derivative versions for clusters, storage and Microsoft’s Small Business Server. Important upgrades included integrating Internet Information Services (IIS), improvements to Active Directory (AD) and Group Policy (GP), and the migration to Automated System Recovery (ASR).