GetSharedDefaultFolder and permission issue

[Bingo]

I'm using GetSharedDefaultFolder to access another user's
folders.

I set up two users, user1 and user2. I gave user2 the
read permission/Reviwer permission on user1's default
Inbox. GetSharedDefaultFolder works fine when user2
tried to get emails in user1's Inbox. Then I gave user2
the owner permission on user1's default Delected Items
folder. GetSharedDefaultFolder failed when user2 tried
to access this folder. I tried different permission
settings on the default Delected Items folder, but none
works. I even tried to give the permission on user1's
whole mailbox but it does not seem to affect any of the
default folders since I still have to assign the
permission on each of the defaul folders. Any
recommendations? Thanks.

 

[Bingo]

Found the answer from MSDN.

http://support.microsoft.com/?kbid=294186