The link to ITcomparison.com I posted yesterday received some critics. With todays link I am trying to get you involved and ask you to share your knowledge.
There is a comparison of email clients on Wikipedia. It compares even more than just IBM Lotus Notes and Microsoft Outlook.
I am explicitely not asking you to start a WIKI-War! If you think information is missing: add that information and post a reference link to the product documentation if possible.
I did not find a comparison of email server software yet. What do you think, is it worth creating one on Wikipedia?