Exchange 2010 Outlook 2010 unable to open another users calendar (it is hidden). I unhid the mailbox and they could connect, however after I hid it again they lost their connection.joerabbi

Hi, What service pack and RU is your Exchange 2010 running? I thought this was fixed in one of the SP1 rollups. Can't remember which one at the moment.Sean Massey | Consultant, iUNITE Feel free to contact me through My Blog or Twitter. Please click the Mark as Answer button if a post solves your problem!

sp1 rollup 6joerabbi

Does using the method of providing the legacydn work for you as documented here - http://www.remkoweijnen.nl/blog/2011/01/25/adding-a-hidden-exchange-mailbox-to-outlook/Sean Massey | Consultant, iUNITE Feel free to contact me through My Blog or Twitter. Please click the Mark as Answer button if a post solves your problem!

No, Outlook could not resolve the name.joerabbi

Hi joerabbi, How did you share user's calendar? Outlook->Calendar folder->Calendar Properties->Permissions? If yes, I test in my lab(Exchange 2010 SP1 RU6), and same result as yours: Microsoft Outlook does not recognize "name". Similar post, please see: Outlook 2007 Trying to open other users Folder that has hide from exchange address lists on the account http://social.technet.microsoft.com/Forums/en-US/exchangesvrclients/thread/bff1a2e7-1813-47c3-8067-fa54cadb9c1b/Frank Wang TechNet Community Support

Hi Joerabbi, Your not going to like it but I think we need to use a work around, the one defined in this MS KB. http://support.microsoft.com/kb/178721 Regards GB Fraser

The key was saving the username in contacts and using cached mode in Outlook. enable cached mode un-hide mailbox create new email and resolve name, then save to contact list. hide mailbox open shared mailbox (it uses the contact list to resolve the name) joerabbi

Hi Joerabbi, I am pleased you resolved it. I am sure cached mode is not required in most cases, well done. Kind Regards

Fixed In 2010 SP2 RU3.