Will Office 2008 or earlier still work on Mac OSx Mojave, High Sierra, Sierra, El Capitan, Catalina, Big Sur or Monterey?

Office 2008 including Entourage has not been supported my Microsoft since 2013. If Office 2008 or earlier is still working on your Mac, then DO NOT UPGRADE the operating system as you will break it.

Even Office 2011 has been phased out and cannot be downloaded from Microsoft site any more as the only version of Office For Mac now been supported and updated is Office 365 (2019, 2021).

However, DO NOT think that by loading the latest office it will magically transfer all data from Entourage. IT WILL NOT (read on)

Does Entourage and MS Office 2008 work with Sierra, High Sierra, Mojave, Catalina, Big Sur or Monterey?

Definitely NOT

Does Entourage and MS Office 2008 work with El Capitan?

Possibly? Microsoft issued an update to Mac Office 2008 in May 2016 found here

However, before attempting the update we suggest a full export of all emails from Entourage as detailed below.

Does Entourage and MS Office 2008 work with Yosemite?

Possibly? Microsoft issued an update to Mac Office 2008 in May 2016 found here 

However, before attempting the update we suggest a full export of all emails from Entourage as detailed below.

We strongly suggest installing Office 365 immediately, especially if using Entourage for emails but only AFTER you have manually exported ALL the Entourage data

How to export emails, folders, contacts and appointments out of Entourage

If Entourage is still operating, your in luck. There are a number of ways to export the data to Apple mail or Microsoft Outlook.

Some methods are covered here:

https://macwaretools.com/blog/export-entourage-to-outlook-mac/