Object required: 'objXMLEnvelopes' In MailSite Express 5 Using MailSite Express 5 yields an error when downloading mesasges from a pop client while in an Express session. Using a POP client while in a MailSite Express session will yield the following error: Error: Microsoft VBScript runtime error '800a01a8' Object required: 'objXMLEnvelopes' ? POP should never be used to delete messages or remove messages while in a MailSite Express session because MailSite Express builds an XML listing of the messages in the inbox. The POP client will delete the messages while MailSite Express expects the messages to be there. If end users desire to share a mailbox, we recommend that they use IMAP on two mail clients, or to not delete the messages while in a POP session.