XMail v0.2 (shows the count of unread mails in the icon)
HEY! Don't forget to download the OpenSSL.zip and to extract the files next to your XWindowsDock.exe!
(I already see the download count of XMail-zip is some steps ahead of OpenSSL-zip

)
What's new:
* Changed the Icon. The credits for this new little masterpiece go to Shishimaru.
Thank you so much, Shishimaru! 
* Should be much more stable and faster. (Please report bugs, if you find some.)
* Some minor options added.
Functionality:
* Shows the count unread/recent/total message in max. 5 accounts
* Supports IMAP only
* Click on the Docklet to run the command you specified in the Settings. (Thunderbird, for example)
* Hold [Ctrl] and Click on the Docklet, to check for Unread Messages instantly.
Installation:
* Check your Firewall: XWindowsDock.exe must be allowed to access internet.
* Extract all the contents of the XMail-zip to the /XWindowsDock/Docklets/ - Folder.
* Extract all the contents of the OpenSSL-zip to the /XWindowsDock/ - Folder.
* You have to end up like this: (only essential file are listed)
../XWindowsDock/libeay32.dll
../XWindowsDock/ssleay32.dll
../XWindowsDock/Docklets/XMail/XMail.dll
../XWindowsDock/Docklets/XMail/default.png
../XWindowsDock/Docklets/XMail/overlay1.png
../XWindowsDock/Docklets/XMail/overlay2.png
../XWindowsDock/Docklets/XMail/overlay3.png
../XWindowsDock/Docklets/XMail/overlay4.png
../XWindowsDock/Docklets/XMail/overlay5.png
../XWindowsDock/Docklets/XMail/overlaysettings.png
Usage:
* In the Edit Dialog, type in your IMAP-Settings (only IMAP supported, right now).
* Click on Test Settings - Dialog.
* If you get an error, check your settings or ask for help.
GMail-Settings (by request):
Server: Imap
Host: imap.googlemail.com
Username: [noparse]yourname@googlemail.com[/noparse]
Password: yourpass
Use SSL: checked!
Unsorted Wishlist: (Feature Suggestions, I am aware of)
* POP3 Support * Proxy Support * Preview Messages/Message headers *
Check on startup *
Check for new Messages (not only "unread") * Audio-feedback *
Make the check faster * Click on a Badge opens the corresponding email account *
Thanks to Shishimaru for creating the wonderful Icon!