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This is the group policy that worked for me. .<br />
<br />
In GPO you will find that setting here: <br />
User Configuration\Administrati<wbr />ve Templates\Microsoft Outlook 2010\Outlook Options\Preferences\E-mail<wbr /> Options\<br />
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In the right panel search for: Do not use Conversational arrangement in Views and set it to Disabled.
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This is the group policy that worked for me. .

In GPO you will find that setting here:
User Configuration\Administrative Templates\Microsoft Outlook 2010\Outlook Options\Preferences\E-mail Options\

In the right panel search for: Do not use Conversational arrangement in Views and set it to Disabled.

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I am looking for the regkey to disable the ability to switch on .<br />
Show as conversations
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I am looking for the regkey to disable the ability to switch on .
Show as conversations

Show as conversations in Outlook 2010

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.