Adding new Exchange (2016) rule very slow down Microsoft Outlook

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We have recently rolled out Exchange 2016 + Outlook 2016 across our business, and have just finished migrating users over to this. One of our machine which has 20GB Email (automated emails for logging) takes ages when creating a rule within either Outlook (when you click Add it says Updating Folders... and takes over 10 minutes per rule.
Running...

Adding new Exchange (2016) rule very slow down Microsoft Outlook