Cannot Open the Free/Busy Information, part 2

Applies to Exchange 2010 SP1 and SP2.

Last November, I wrote that I get this error whenever I try to edit the delegate list for multiple resources at the same time:

“Cannot open the free/busy information. You do not have sufficient permission to perform this operation on this object. See the folder contact or your system administrator.”

I was incorrect about this only happening when I edit multiple resource mailboxes simultaneously. it seems to be random. I see it more often in those cases simply because there are more mailboxes in play and therefore more opportunities for something to go wrong. Even when I add a delegate to a single room or equipment mailbox, sometimes the delegate will get this error.

To fix it, I use ExFolders to modify the permissions for the “Freebusy Data” ¬†and “Calendar” folders directly and give the delegate Editor permissions to both. Sometimes the EMC gui adds the permissions correctly, and sometimes it doesn’t. I have no idea why. It has become standard procedure for me now to open ExFolders and double-check every time I modify the delegates list on a resource mailbox. At least half the time, I have to fix the permissions manually.

2 responses to “Cannot Open the Free/Busy Information, part 2”

  1. Wayne Peinke says:

    Did you ever find out why this happens and find any better solution? Or do you still resort to ExFolders?

  2. jay c says:

    Hi Wayne. I’ve never found out why it happens, but I have figured out a reliable way to fix it. I started giving resource delegates “Full Access” permissions to the delegate mailboxes. I know that some organizations will not want to do that, but I’ve found it’s the most reliable way to ensure the delegates have all the access they need.

    Actually, that’s not entirely accurate.

    I’ve taken to creating a universal security group, adding all the delegates to it, mail enabling it, making it the only delegate on the resource, and giving this group Full Access permissions to the resource. Once that is done, I hide the group from the Global Address List.

    That’s a little more labor intensive up front, but it will save a lot of time later, because I never have to mess with the resource delegates again. I just change the membership of the group.

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