It’s getting Worse. Outlook 2010 was “not enough, but nice”, Outlook 2013 worked better (i were able to choose folders, and some other things).
From 2016 it’s getting worse, far worse.
Ignoring WebDAV (CalDAV, CardDAV, which are making the success of some payed plugins), Outlook Unicode PST files are fare more reliable and BIG than the “smalls” local storage of Thunderbird, still limited to 4gb par folder (sometimes works for bigger files but i won’t suggest anyone to try) and also can be detached, copied, attached, filtered, managed in so many ways that Thunderbird, without nice plugins, cannot evenly imagine.
Filtering, rules, and routing (into folders, forwarding, copy, delete) is much more powerful in Outlook, and if you’re using not only the devil (client) but also the hell (Exchange) they are transformed into server rules… Thunderbird cannot remotely spare to transform client filters to Sieve filters.
Please, be kind and don’t get me wrong: i love Thunderbird, it’s my personal first, second and third choice, and it’s always and ever my first crossover suggestion for everyone. But for some things, Outlook it’s far better.
Calendar, sync, Address book, form creating, integration to it’s own application server. Simply bigger, older, better.
But not so well connected (as someone stated before… IMAP, certificates, *DAV). And the “easing” setup of recent versions quite… don’t meet my favor. Office 2013 will be “soon” put out of support (April 2023), so it’s not the best suggestion for anyone who’s looking for a email client.
Getting back to something useful: Outlook and Thunderbird installed on the same PC can “easily” translate a big PST file into Local Storage of TB, which can be used for feed IMAP folders. Only on LAN, please… via WAN it’s quite not viable (unless you have a HUGE capacity of connection)