Attaching attachments from CRM\DMS to emails with Thunderbird is just as easy as with Outlook.
It is also possible to save emails in PC CADDIE via a button in Thunderbird. We have developed a Thunderbird add-on for this purpose. If you are interested, please contact the Support.
A PC CADDIE save button can be added to the inbox:
And also in the window for viewing individual e-mails:
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