We're unable to use the top fields to sort emails.

We can sort by received and by subject but not by any of the other fields.

Folder location does not appear in searches, which is annoying and if it did I'm sure we couldn't use it to sort by.

Searches require a full domain name to search. For example I can search for "example.com" and view all emails from this domain, but I cant search for "example"

Delivery status notification doesn't work.

Suggestions? Web client 5.0.8. zDesktop Build 1251.