Hi Angela
You'll need to tel us quite a lot more before we can give a relevant answer:
What version of Outlook?
Are you running Exchange server software?
Are all users connected to the network?
Anything else you think may be relevvant (we can't see over your shoulder).
Here are some tips about how to post questions:
http://support.microsoft.com/?id=555375
Regards
Judy Gleeson
MVP Outlook
Trainer and Consultant
There are various articles about using Outlook here:
www.judygleeson.com
Canberra, Australia