The test results you have selected are very old and may not represent the current state of Wine.
Selected Test Results (selected in 'Test Results' table below)
Conferences, composing emails, calendar, icons, background image, attachments, and everything I've tried after using it for 4 months.
What does not
Opening attachments causes the computer to prompt the user to install a program capable of properly opening up the attachment file (unless the specified program is installed in Wine, like Microsoft Office for .doc files). This can be worked around by downloading the file onto the local drive.
What was not tested
You can open attachments directly in Linux by installing the open_native script. See note "Open FirstClass attachments and links" : http://appdb.winehq.org/objectManager.php?sClass=version&iId=24844