Running XP OL2003, VS 2002 pro, I wrote an Outlook Addin.. worked fine.
Did something like: process AppointmentItems based on a Custom Form
(MessageClass= IPM.Appointment.Reservation) in an Outlook calendar folder
named "Reservations" like:
Dim objAppts As Items
Dim objAppt As AppointmentItem
objNS = objApplication.GetNamespace("MAPI")
objAppts =
objNS.GetDefaultFolder(OlDefaultFolders.olFolderCa lendar).Folders.Item("Reservations").Items
objAppts.IncludeRecurrences = True
objAppt = objAppts.Item(1)

(just an example.. I know how to write AddIns..everything worked fine..)

Then: Installed VS 2005 Pro. From this moment on I got an
InvalidCastException at this line:
objAppt = objAppts.Item(1)
(still running this AddIn under VS 2002.. did nothing with VS 2005, just
installed it)

Wrote a Win.exe to test this; found out: after installing VS2005 I get the
InvalidCastException in VS2002 if the messageclass is not exactly
"IPM.Appointment"; before it also worked with "IPM.Appointment.Reservation".
To prevent some answers that won't help:
This AddIn uses Framework 1.1:
'DefaultDomain': 'c:\windows\microsoft.net\framework\v1.1.4322\msco rlib.dll'
geladen, keine Symbole geladen.
'Domain2': 'c:\windows\microsoft.net\framework\v1.1.4322\msco rlib.dll'
geladen, keine Symbole geladen.
...and so on..(german version..)
TypeName(objAppts.Item(1)) is "AppointmentItem" (no distribution list in
this folder..just AppointmentItems with messageclass
IPM.Appointment.Reservation..)

What I tried so far: uninstalled VS 2005, uninstalled Framework 2.0.. no
luck.. same result..
Uninstalled Framework 1.1, 1.0; reinstalled Framework 1.0, 1.1..Setup repair
of VS 2002.. no luck..
Unchecked, rechecked the .NET Programmability Support for Outlook in Office
Setup, tried any combination with installing uninstalling redistributable
PIA's.. and so on..

Please help.
Thank you, Frank

Solution. or better.. Bug report.. postet in
microsoft.public.outlook.interop with the same subject.
It's actually not just an AddIn problem..

Regards, Frank

"Frank Sharp" schrieb im Newsbeitrag
...
Running XP OL2003, VS 2002 pro, I wrote an Outlook Addin.. worked fine.
Did something like: process AppointmentItems based on a Custom Form
(MessageClass= IPM.Appointment.Reservation) in an Outlook calendar folder
named "Reservations" like:
Dim objAppts As Items
Dim objAppt As AppointmentItem
objNS = objApplication.GetNamespace("MAPI")
objAppts =
objNS.GetDefaultFolder(OlDefaultFolders.olFolderCa lendar).Folders.Item("Reservations").Items
objAppts.IncludeRecurrences = True
objAppt = objAppts.Item(1)

(just an example.. I know how to write AddIns..everything worked fine..)

Then: Installed VS 2005 Pro. From this moment on I got an
InvalidCastException at this line:
objAppt = objAppts.Item(1)
(still running this AddIn under VS 2002.. did nothing with VS 2005, just
installed it)

Wrote a Win.exe to test this; found out: after installing VS2005 I get the
InvalidCastException in VS2002 if the messageclass is not exactly
"IPM.Appointment"; before it also worked with
"IPM.Appointment.Reservation".
To prevent some answers that won't help:
This AddIn uses Framework 1.1:
'DefaultDomain':
'c:\windows\microsoft.net\framework\v1.1.4322\msco rlib.dll' geladen, keine
Symbole geladen.
'Domain2': 'c:\windows\microsoft.net\framework\v1.1.4322\msco rlib.dll'
geladen, keine Symbole geladen.
..and so on..(german version..)
TypeName(objAppts.Item(1)) is "AppointmentItem" (no distribution list in
this folder..just AppointmentItems with messageclass
IPM.Appointment.Reservation..)

What I tried so far: uninstalled VS 2005, uninstalled Framework 2.0.. no
luck.. same result..
Uninstalled Framework 1.1, 1.0; reinstalled Framework 1.0, 1.1..Setup
repair of VS 2002.. no luck..
Unchecked, rechecked the .NET Programmability Support for Outlook in
Office Setup, tried any combination with installing uninstalling
redistributable PIA's.. and so on..

Please help.
Thank you, Frank