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I believe Thunderbird has the strongest ties to LibreOffice. https://wiki.documentfoundation.org/Ideas_for_the_integratio...

Roundcube + the calendar plugin is the closest I've found to an outlook alike for Linux, if that helps. Bit more complicated to setup, but does the trick.

Geary was/is considered becoming a GNOME circle/core app but there're still some few unresolved issues.

I tried it, but didn't really like how it worked. What I would love would be some form of imapsync between IMAP (and icalsync for iCal) servers and a local (Maildir?) folder and an app that can view the contents of that local folder as an e-mail and calendar client.

Extra points for managing space by deleting files and keeping some form of pointer to the original content.

can you still not view emails in text mode by default in Geary?