It might be the senders' issue. It's hard to say without knowing your version of Outlook.

--
Sue Mosher, Outlook MVP
Author of Configuring Microsoft Outlook 2003
http://www.turtleflock.com/olconfig/index.htm
and Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx


"Tal" wrote in message ...
I get some meeting invitations as plain text mail which can not be "accepted"
in the calendar. I do get other meeting requests (from other people) as
calendar items. meeting requests that I send out are accepted as calendar
items. I assume it is due to a definition on my side - i just can't find it...