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Exchange 2003 Mailbox Permissions

Posted on 2008-06-17
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Last Modified: 2013-11-15
We just came across an issue the other day that If our users found out could cause some serious harm. Somehow anyone with an exchange mailbox can open anyone else's mailbox including calendar. When I went into Mailbox Rights under the Exchange Advanced tab in AD I noticed that there were quite a few users that had access to my particular mailbox. However when I tried to remove them I would get the following message:

 "You can not remove "Everyone" because this object is inheriting permission from its parent directory. Turn off the option for inheriting permissions, and then try removing again."

How can I fix this so that I can remove "Everyone" from being able to view everyones mailbox?
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Question by:FBTC_Helpdesk
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DocCan11 earned 250 total points
ID: 21807912
Find a point above your user accounts and turn off inheritance.. this seems very strange.. it seems as if someone who did not know what they were doing added the everyone group to AD permissions.. I would try and find this and remove it.. It will be in your AD somewhere..
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by:pamiken
pamiken earned 250 total points
ID: 21808017
Wow,  that's really bad.  Goto Exchange system manager.

open -server
right click your server, goto "security" tab
assign appropriate permissions.  

If it's not there then go down the tree (ie right click "first storage group", security, etc)

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by:FBTC_Helpdesk
ID: 21824467
Just out of curiosity, what users/groups should be listed under mailbox rights under the Exchange Advanced tab in AD?
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