We have SBS 2003 Standard running Exchange 2003 SP2. We have created Public Folders for certain divisions of our company in which we store contacts including Distribution LIsts. Recently, we have started to get an error when trying to open multiple distribution lists. Error: "Can't open this item. There is not enough memory available on the Microsoft Exchange Server computer to perorm the operation. Contact your system administrator". I have read multiple articles on this error and understand that there is a size limit to a distribution list. However, I have not found out what this size limit is exactly. Is is different for a Public Folder DL than it is for a Personal Folder DL? If so, what are the limits for each (In size. I understand that it is not the number of contacts in the list)? I have also exported a .pst of the Public Folder and imported it into an Exchange email account and can open it with no problem (this confuses me as well), but it will not allow me to copy multiple contacts which would allow me to create multiple DL's nested inside of one. If I go to the properties of the DL when it is in my Exchange Account, it says the folder size is 31KB. That seems awfully small to me. Is there no way to make the DL larger without nesting multiple DL's into one?