Magellan
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A long time ago, I worked on developing Magellan, an outlook-like client for Linux/KDE. I worked on front-end and some backend stuff (until the back-end moved to CORBA that is). I also did the art (icons, gui...) for it.
Here are some screenshots:
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The email interface supported POP3 and IMAP.
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The contacts component was aware of the v-card format.
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We had a sticky notes interface, with popup borderless windows!
Maybe at some point I'll write more about it, because it was cool 😄