We are running Exchange 2010 SP1. The client is Outlook 2010 SP2. There are a number of Contacts in a Public Folder that we use regularly. Some of these Contacts are Distribution Lists of varying sizes. For the most part, all Distribution List Contacts can be opened with no issues. We do have a single Distribution List that gives us an error when we try to open it. The message is "Cannot open this item. There is not enough memory available on Microsoft Exchange to perform the Operation". I did some checking using Google and it appears we are dealing with some kind of size limitation enforced in Exchange. I say Exchange because I can open the PST file containing the Contacts and this particular DL locally using Outlook and I can open the DL with no problem. It just seems to be an issue opening it from within the Public Folder on the server. The Contact DL is 36KB in size. It has about 120 entries. I suppose I can try to break it up into 2 DL's but that is a lot of work. Is there some kind of hotfix available that addresses this problem? If not, what would be the easiest way to break up this DL into 2 or possibly 3 DL's to make them smaller?