XP Client: "0" byte file overwrites

System

Hello All--
My client has recently converted from Windows 2000 to XP Professional. Our users do not have admin. privileges on their laptops. The users connect online (read: follow outlook mode) with trusted login. In Windows 2000, all appeared well. In XP, users highlight on a document from the document grid in MailSite, double click to open. The content opens, however, when the users close the document, new versions as "0" bytes are created. Our users in most cases have not created the new "0" byte documents, however in some cases have.

Have any of you seen this particular issue? If so, what is the resolution? I am thinking that this has something to do with permissions, however, I do not know exactly what.

Please advise.

Kind regards,
Paula DiTallo