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title: Migrating Message Properties
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# Migrating Message Properties

> For the full documentation index, see: https://docs.mulesoft.com/llms.txt

In Mule 3, there are several property scopes that you can use for different purposes. In Mule 4,
most of these scopes have been removed.

## Invocation Properties

Invocation properties are now called `variables` in Mule 4. Their behavior is exactly the same as in
Mule 3.

## Inbound Properties, Outbound Properties, Inbound and Outbound Attachments

These scopes do not exist in Mule 4. See [Intro Mule Message](https://docs.mulesoft.com/mule-runtime/4.3/intro-mule-message) for more
information about migration.

## See Also

[Introduction to Mule 4: The Mule Message](https://docs.mulesoft.com/mule-runtime/4.3/intro-mule-message)

[Mule Events](https://docs.mulesoft.com/mule-runtime/4.3/about-mule-event)

[Mule Message Structure](https://docs.mulesoft.com/mule-runtime/4.3/about-mule-message)

[Variables in Mule Events](https://docs.mulesoft.com/mule-runtime/4.3/about-mule-variables)