I have a small 10 computer network running exchnage server on the SBS 2003 server. Exchange server is only used to allow the users to share and view each others calenders. The exchange server is not used for any email handling. For email my users have a standard POP email host. On each client computer outlook is configured with 2 accounts, a pop email account (example: firstname.lastname@example.org) and an exchange account (example: email@example.com). When my user go to their outlook calender and try to create a new appointment they add the email addresses to the invitees list and send the appointment. Outlook returns the error message:
0x800ccc6e The respnded: 553 firstname.lastname@example.org is not allowed to use this function.
If I remove the exchange account from outllook then the users a allowed to send new appointment notifcications to invitees. If the exchange account is active I get the above error message and appointments cannot be sent to invitees. Note: this use to work until recently.
THIS OCCURED AFTER INSTALLING NORTON ANTIVIRUS SMALL BUSINESS 10.0. I have disable and even uninstalled NORTON and the same issue is still present. Norton has changed something with the op system or exchange server.