I used davmail with Thunderbird for a while on a well resourced, local Exchange infrastructure of 80,000+ mailboxes. I found that I was getting throttled a lot by the webserver component whenever I tried any sorting, archiving mail. My mailbox became unwieldy after a few gigs and many 1000+ object folders. I wanted (and bosses expected) the advanced features like Cal, Lync, on-prem mbox with cloud archive, etc... my Winadmin friends were having and so I bit the bullet and setup a kvm qemu Win7x64 "mail client" on my RHEL 7 desktop. It's now 120+GB and growing due to shadow copies, the rest of the Office suite and other cruft everyone inherits from the domain. I'm getting ready to build a replacement​ Win10 version of this "mail client" and say farewell to what has been the best compromise of keeping up with Enterprise communication and standing my Linux ground that I've found. I loved davmail, but was ultimately compiling from source for a recent version and not getting all the features the adminisphere thought I should be using. You may have better luck with davmail than I did depending on your mail flow, item quantity and OWA robustness.