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Online presence allows users of your site to see if other users are online and allows real-time communication. To enable online presence, your users must have Microsoft Office 2003 installed, and must have an account for and be running Microsoft Windows Messenger or MSN Messenger.
Note The e-mail address for the account must be the same as the e-mail address for the user account in Windows SharePoint Services.
The Office 2003 installation includes an ActiveX control that allows Microsoft Windows SharePoint Services to return online status for site users. This control checks the e-mail address for the user and directs a query to the presence server for that client to see if the user is online. The ActiveX control does not store online information or e-mail addresses; it simply directs queries from the site to the e-mail address and returns the appropriate status.
You can enable or disable online presence information at the virtual server level. When you enable online presence for a virtual server, it is enabled for all sites and subsites of that virtual server.