The integration of GPG into the client was a great move. The addition of dark mode is also good to keep up with the times. After all this while, the best thing I love about this release is the simplification of the To (and also CC and BCC) list into one field instead of being multiple rows (it was always painful to scroll).
I used to use Thunderbird as my only mail client for many years and still prefer it for personal accounts. I loved global search when it was launched, but that was not improved over time for accurate searches, especially for large mailboxes (I struggle to find mails with it in mailboxes that are a few Gigabytes in size).
Thunderbird has not focused on built-in MS Exchange support (especially including calendar), which, combined with environments where IMAP is disabled, makes it a no-go. I know of one commercial extension (Owl) that works with MS Exchange/Office 365, but that extension requires the purchase to be made by providing which email address one wants to use it for. It’s a privacy concern that the developer said they wouldn’t fix. So I’m stuck with Outlook Web Access at work (I refuse to use the Outlook client).
It is OpenPGP capability that is being integrated into the client, not GnuPG. You will have to import your keys from any existing GnuPG installation. Any new keys you add in Thunderbird will not be accessible to other things that use GnuPG.
I used to use Thunderbird as my only mail client for many years and still prefer it for personal accounts. I loved global search when it was launched, but that was not improved over time for accurate searches, especially for large mailboxes (I struggle to find mails with it in mailboxes that are a few Gigabytes in size).
Thunderbird has not focused on built-in MS Exchange support (especially including calendar), which, combined with environments where IMAP is disabled, makes it a no-go. I know of one commercial extension (Owl) that works with MS Exchange/Office 365, but that extension requires the purchase to be made by providing which email address one wants to use it for. It’s a privacy concern that the developer said they wouldn’t fix. So I’m stuck with Outlook Web Access at work (I refuse to use the Outlook client).