You can encrypt and decrypt existing archives.
The mail parser is one of the core parts of the application and makes the preview and the attachments of the mails.
The new parser is much much faster than before. In my testing I have seen archiving time 100% faster than before.
Images in the mail weren't shown at all in version 4. There was an extra attachment with the content of the image.
Version 5 loads the inline images into the mail preview.
In version 4 you could load the external images when you loaded the mail.
But sometimes is necessary to preserve the mails as they were. Not all external images are available forever. Download and save everything into the mail with the new option "Download remote content".
The most complex attachment names can now be handled correctly.
Image and PDF attachments are shown inline with the mail. All other attachments have a clickable document preview.
Simple mails have nicer quotes.
Screwed up umlauts can be recovered. A typical example is "Mit freundlichen GrÃ¼ssen" which is "Mit freundlichen Grüssen".
All new features except the speed are not available automatically for existing mails. Use Reparse and Reparse/Download Remote Content in the Database menu to update your mails.