Mails Disappearing from Outlook

This solution may be useful when the user meets the following conditions:

1. the user has two or more workstations where they can access O
2. the user says that mails appear on one computer and not in the other one
3. or mails appear on one computer, but disappear shortly afterwards
4. mails in sent items, do not disappear

Solution:

You may want to check the mail delivery settings of the user's Outlook client on one of their workstations. It may be that one of the PCs have a setting which send new mails to a different location (and not their primary mailbox) such as a .pst file.

To see this, go to Tools > Email Accounts. In the wizard, find the part where you are given the option to 'Deliver new e-mail to the following location'.

Make sure that the option selected is their exchange mailbox and not some .pst file. It should be ok afterwards, but any previous mails should be transferred manually to the exchange mailbox or they would have to copy the .pst file to the other computers.