Thanks Ken
Yes the security setup for CAS run correctly.I checked the
settings -fulltrust permission
appears in framework configuration.all prerequisites also exist.The m/c on
which it gives
problem is having Office ultimate 2007 whereas other 2 machines have Office
enterprise 2007.
I'm still finding the cause behind this behavior but invain..

"Ken Slovak - [MVP - Outlook]" wrote in message
...
Did the security setup for CAS run correctly for the addin? Do you see the
settings for full trust appearing in the framework configuration utility?
What's different about the machines where it works and where it doesn't?
Is everything required installed on that machine (VSTO runtime, PIA's,
etc.)?

--
Ken Slovak
[MVP - Outlook]
http://www.slovaktech.com
Author: Professional Programming Outlook 2007
Reminder Manager, Extended Reminders, Attachment Options
http://www.slovaktech.com/products.htm


"shubhangi" wrote in message
...
hello
I've VSTO SE Addin for Outlook 2007.When I install addin setup on one
machine it gives me error "The form region cannot be opened.The form
region manifest specifies an add-in that is not installed". In COM Addins
dlg in outlook , addin is described as unloaded ( in registry
LoadBehavior is 3).Form region entries are present in registry.
This error doesn't appear on other 2 machines when I install same setup
there ,addin works correctly ,form regions are also shown.What might be
the reason behind this?

thanks