Recently we have moved all shares from an old file server to a new one. The shares on the old server were then disconnected, and everything seemed to be working fine using only the new server. Once we shut the old server down, Outlook started to take an unreasonable amount of time to open attachments by double clicking them in the email. Saving the attachment first and opening from the local computer works at normal speed. Turning the old server back on seems to fix this, but we are looking to retire that machine.