Radicati : Microsoft has 58% marketshare for active corporate desktop clients

Email Clients
“In 2005, we project 1,196 million email mailboxes worldwide, and 1,575 million email clients worldwide. This averages out to 1.32 clients per mailbox.”

“Microsoft Outlook holds a 58% market share for active corporate desktop email clients with 382 million active clients.”

Via : Radicati Quick Facts

How is that for marketshare discussions ?