A personal distribution list in an Outlook folder in an Exchange mailbox or public folder -- as opposed to a DL in Active Directory -- can hold only roughly 120 members. Why don't you just perform a mail merge using the spreadsheet as the data source?

Signature
Sue Mosher, Outlook MVP
Author of Configuring Microsoft Outlook 2003
http://www.turtleflock.com/olconfig/index.htm
and Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx
>I have about 8000 email addresses in an Excel spreadsheet that need to be
> imported and created into a Distribution List in MS Outlook.
[quoted text clipped - 6 lines]
>
> Please advise, any help is greatly appreciated. Thanks!