Outlook 2011

I'm trying to upgrade my iMac (late 2015) to Catalina from High Sierra (Mojave screwed up my Mac so badly the Apple pros had to roll it back to High Sierra). I want to save my emails and calendars from Entourage 2008, so I exported them via Main Identity.rge to Outlook 2011. However, I'm having trouble getting the .olm file export from Outlook 2011. The program just freezes.

Also, I've read that I can't access Outlook 2011 in Catalina.

Is there another way for me to save those files and access them in Catalina?

Thanks.

Hazel Hanford