What should I do if most of the messages are gone after the mailbox is filtered?

With filtering enabled, most of the messages in your Outlook Inbox are missing

1. A user opens the Outlook Inbox and finds that most of the messages are missing except this week's messages.

2, through the communication with the user, excluding the user's own deletion of the possibility of viewing the data file PST capacity of more than 1G, but the visible part of the message size is obviously not up to this data.

3, this suspicion that most of the mail is hidden, by looking up the properties of the Inbox, in the view-> the current view-> the custom current view has a filtering function,

4. In the filter, the receive time is selected for the last 7 days, so only the messages received in the last week are displayed in the Inbox.

5, the above choice of time options, the hidden message again appears in the Inbox, the problem solved.