Email

MS Live Hotmail

Google Mail

Yahoo Mail

GMX

web.de

De-Mail

ePOST

eMail / Calendar

Microsoft

• MS Office: Outlook
• Windows Mail

Lotus Notes

mozilla Thunderbird

Apple Mail

Evolution 
Zimbra
Eudora
Pegasus
Incredimail

Web Clients

Messenger & Chat

MS Live Messenger

• Web Messenger
• Office Communicator 

Yahoo Messenger

Google Talk

AIM

Skype

Jabber

ICQ 

Collaboration