Sharing 2007 calendar with 2003 user?

[degas1900]

Some in my office use Office 2007 and some use 2003. I want to share a new
2007 calendar with a 2003 user. I set up the new calendar with permissions
for the other users, but they cannot open the calendar. What can fix this?

 

[TT]

Any error messages for the 2003 users trying to open up your shared calendar?
Access denied?

If you click on Calendar Permissions do the users who you want to share your
calendar have the necessary permission levels for their name?
Reviewer - read only, Editor - read/write

TT