Eschange Distribution Lists

In the past i have seen this as both a server and a client issue. Something you might want to try is going to the client and removing his profile from outlook and rebooting then reconfiguring the outlook profile. As far as server side you can try toremove the User as owner and replacing with yourself or leaving it blank; Better to try yourself and then making sure you can modify the list. Once the user has been removed as owner wait for exchange to update and then re-add the user as owner and allow for exchange to update. then have the user reboot, re-login, and try again.
If that doesnt work I've even had to go as far as removing the distribution list and re-creating the list. . Some of these issues are resolved or even caused by Exchange server Service Packs so you might want to look at upgrading to the latest Service Pack or uninstalling the last installed Service Pack.

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