Why is outlook re-creating my OST file?

Occasional Visitor

I am testing a new image that I built for our VDI environment.  Same as the old image with W10, Office2016, same OU with GPO's.  User 1 logins into old vm and everything is fine with Outlook, they logout and into new vm and Outlook re-creates the OST (email is in o365) and begins to download all of their email again and such.  My question is, why isn't Outlook using the OST it is presented with already?  What would cause it to re-create the OST?

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