After a cross-forest Ex2003 to Ex2010 migration, some users are unable to share their calendars with other users. UserA using Outlook 2007, cannot share their calendar with UserB. The error message UserA gets is: Calendar sharing is not available with the following entries because of permission settings on your network I set up a new Outlook profile using Outlook 2003 for UserA, and they were able to share their calendar and add UserB as a reviewer. Haven't tried setting them up with a new profile on Outlook 2007, will do that tomorrow. I did check the user to ensure they were being updated by the 2010 email address policies. Also verified UserA's calendar and permissions weren't corrupted using ExFolders. User C with outlook 2007 can share his calendar as usual, but his mailbox wasn't migrated cross-forest and isn't a linked mailbox- it's a normal Ex2010 mailbox. The migrated mailboxes are linked to their original Ex2003 user account in the old forest. Full domain migration will take place at a later time. Any other things to check? Thanks

Hi, Whethe the SID history was stamped on the migrated account? Please understand that the Sid history holds security identifier information of the orginal account which can access the original resource. If the sid history was not migrated to the target account, the original permission which you granted will not work. Thus, you need to remove the permission and re-add it. Thanks Allen

Hi, Any update on this issue? Thanks Allen

I am having an issue that has a similar scenario. When I try to share my calendar with another specific user I get the message that "Calendar sharing is not available with the following entries because of permission settings on your network: I get this if I am using Outlook 2K10 or 2K7. I also tried in Outlook 2K10 to just go to Calendar Permissions and click the Add button and select the user. However I noticed that the user I want to Add had a red circle with a diagonal line as shown in the image below. I can select someone with out the red circle and share the calendar without an issue so is it a pemissions issue with some of the mailboxes? All mailboxes were migrated from a 2K3 Exchange and domain to 2K10 Exchange and 2K8 domain so is it possible some of these accounts did not migrate correctly. If so how do I correct the issue?

We've run into this problem before. It was caused by an Outlook Autocomplete cache entry that was pointing to a users OLD Exchange DN. When accounts get migrated the old DN is no longer in AD. There are two approaches you can take, the first one is to have users clear thier autocomplete caches, the second one is to add their old DN back in as an x500 address (see the E-Mail Addresses tab). There will be cases when you will need to do both, such as migrating from another non-Exchange mail system. Good Luck!

I have seen this problem several times and the solution has always been to simply use the GAL rather than typing in the email address. See http://www.urtech.ca/wp-admin/post.php?post=2913&action=edit&message=6 I hope this helps.Ian Matthews www.urtech.ca www.commodore.ca