Issue:
Outlook user cannot open or edit Outlook Distribution List (DL) using Outlook on an Exchange mailbox or user receives a "This distribution list has reached the maximum size for your network e-mail server" error message when you try to open or add many items to a contact distribution list in Outlook
Solution:
Use Outlook Web Access to open the problematic DL and trim the members of the DL
Cause:
This is a limitation of distribution lists that are created and stored in a Microsoft Exchange Server mailbox store. There is no definite limit to the number of contacts that you can add to a distribution list. The exact limit is based on the total file size of the contacts.
If you use only the very basic information for contacts, your distribution list limit may be as many as 125 contacts to 130 contacts. For example, the information for the contacts in a list of this size may include only the name and the e-mail address for each contact. You can create very large distribution lists that contain over a 1,000 contacts. However, these very large lists may not function as expected in Outlook.
For best results, the typical number of contacts that you should add to a distribution list is between 50 contacts and 70 contacts. However, if the contacts contain lots of information, the distribution list limit should be as small as 25 contacts.
Additionally, the distribution list limit is based on the property size limit of the computer that is running Exchange Server. The property size limit for an Exchange server is about 8 kilobytes (KB). The Exchange server stores all contact links in one property store. Therefore, the distribution list limit also depends on the average length of the contact's name and the average size of the entry ID. The size of the entry ID depends on the type of e-mail address and the length of the message.
Once a large DL created and near the limit, then you modified members of the DLs in your contact list that could potentially increased the size of the DL and over the limit then you are not able to open or edit the DL.
Outlook user cannot open or edit Outlook Distribution List (DL) using Outlook on an Exchange mailbox or user receives a "This distribution list has reached the maximum size for your network e-mail server" error message when you try to open or add many items to a contact distribution list in Outlook
Solution:
Use Outlook Web Access to open the problematic DL and trim the members of the DL
Cause:
This is a limitation of distribution lists that are created and stored in a Microsoft Exchange Server mailbox store. There is no definite limit to the number of contacts that you can add to a distribution list. The exact limit is based on the total file size of the contacts.
If you use only the very basic information for contacts, your distribution list limit may be as many as 125 contacts to 130 contacts. For example, the information for the contacts in a list of this size may include only the name and the e-mail address for each contact. You can create very large distribution lists that contain over a 1,000 contacts. However, these very large lists may not function as expected in Outlook.
For best results, the typical number of contacts that you should add to a distribution list is between 50 contacts and 70 contacts. However, if the contacts contain lots of information, the distribution list limit should be as small as 25 contacts.
Additionally, the distribution list limit is based on the property size limit of the computer that is running Exchange Server. The property size limit for an Exchange server is about 8 kilobytes (KB). The Exchange server stores all contact links in one property store. Therefore, the distribution list limit also depends on the average length of the contact's name and the average size of the entry ID. The size of the entry ID depends on the type of e-mail address and the length of the message.
Once a large DL created and near the limit, then you modified members of the DLs in your contact list that could potentially increased the size of the DL and over the limit then you are not able to open or edit the DL.
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