Need to give permanent categories to emails in Outlook for intra-office messages

There are 4 people in the office, which is using Outlook 2013. The head wants to send email to the staff with a custom category attached. He wants this category to be retained in the recipient's Outlook. They are using hosted Exchange.

The hosting company says that this is not a feature.

Is there a third-party application that can be used?

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David LeeCommented:
There is no way to enforce the retention of a category.  In fact, by default Outlook removes categories from received messages.
Alexei KuznetsovMicrosoft Outlook MVPCommented:
In Outlook 2013 it's pretty easy to enable the retention of categories. Just set SendPersonalCategories DWORD registry value to 1 (in HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\15.0\Outlook\Preferences registry key) or configure it using GPO for required users.

The other problem is Exchange. In order them not to be cleared, you need to execute the following PowerShell command:
Set-TransportConfig -ClearCategories $False

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This is what your Exchange provider has to do.

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David LeeCommented:

Will those setting prevent the recipient from deleting/altering the categories themselves, or will those settings only stop Outlook/Exchange from removing the categories automatically?
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Alexei KuznetsovMicrosoft Outlook MVPCommented:
This will only stop O/E from clearing the categories. There is no way to prevent users from altering categories in Outlook items (including messages), of course. And this is done for a reason: categories is a very personal tool. It is a bad practice to use company-wide categories for messages (shared calendars are ok, though).
computerlarryAuthor Commented:
Would there be a third-party product that might do this?
David LeeCommented:
There's no way to prevent a user from deleting or altering categories.
computerlarryAuthor Commented:
I appreciate the technical information provided.
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