Unable to display (public) folder in Win XP Outlook 2002

[Glenn]

Hi All,

We have Windows 2003/Exchange 2003/Isa 2000 in one server.

The problem:
A user (User A) with Win XP / Outlook 2002 (Sp1, Sp2 ans Sp3) can open
the exchange mailbox but gets "Unable to open folder. You do not have
sufficient
permission to perform this operation on this object..." message on the
public folders.

User B with Win 98/Oulook 2000 can access his exchange mailbox and the
public fodlers
without a problem.

Users A and B are identically created accounts in Exchange.
But when I logged into the Win 98 machine using User A account then created
User A exchange account in Outlook 2000, User A was able to access the
public folders.
Conversely, when I logged in User B in the Win Xp machine and created an
exchange account
User B, the same problem (unable to display...) occured.
So it looks like a permission issue but not really a permission issue. =;^D

I searched for this kind of issue but can't find anything similar to this
scenario.
Any help, tip, etc to solve this mystery is greatly appreciated.

Thanks,

Glenn