Problem with security groups on exchange

Hi all,
I have a problem with our AD forest. We have one top domain called something.local
and 2 child domains called domain1.something.local and domain2.something.local

The exchange 2000 server is running in the top domain, native mode, and the whole forest is running in native mode.
The thing is that we have several mailboxes that a number of users should be able to access in outlook.
When i add the users to mailbox rights everything works fine, but when i add a security group to the mailbox rights containing the users that should have access to the mailbox, they cant open it in outlook. I have tried with domain local/global and universal groups but nothing works. I also have run netdiag and other tools but they cant find any problems with the AD.



Suggestions anyone?
I would have put more points into this if I had =)

LVL 4
mcsalladAsked:
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trywaredkConnect With a Mentor Commented:
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http://support.microsoft.com/default.aspx?kbid=817433
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trywaredkCommented:
Add each user separately

Many Regards
Jorgen Malmgren
IT-Supervisor
Denmark

:o) Your brain is like a parachute. It works best when it's open
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mcsalladAuthor Commented:
Yes, I have done that, but since we have a lot of shared mailboxex and a LOT of users that is too time consuming, why doesnt it work with groups?
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howellrjCommented:
Have you tried distribution groups as opposed to security groups, security groups have ACL's associated with them, which in this case it doesn't sound like you need.  Distribution groups are to organise other groups and users and should solve your problem.
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mcsalladAuthor Commented:
Well, that doesnt work, I can tell you without even trying, you cant give mailbox rights to a distribution group...
Distribution groups are precisely what they sound like, distribution groups nothing else
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mcsalladAuthor Commented:
Hum, when I create the groups in the top domain everything works fine, but not when I create them in the subdomains..
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mcsalladAuthor Commented:
Hum, when I create the groups in the top domain everything works fine, but not when I create them in the subdomains..
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