Outlook 2013 not showing new emails

So we have to accounts connected to our outlook. secondary account was at one point showing when a user gets a new email. now pop ups and disappears one the user closes out and goes back into outlook. I have switched between showing new and showing all with no luck. I have also tried to disconnect, restart the machine and then reconnect the account but it is still not showing up. I am not sure if anybody else has had this issue. I am wondering if it is windows update issue but I haven't been able to pinpoint one that might cause this. any help would be great. thank you.
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Shweta GoelCommented:

In Outlook under Folder > IMAP folders. “When displaying hierarchy in Outlook, show only the subscribed folders” this option should be unchecked. Now, click on Send/Receive.
lmfsAuthor Commented:
When we set up an account we do not use pop or imap we use Microsoft exchange server. I do not have an imap folder under folders. its is odd that it has only happen it 2-3 people in the office and we have 60+ users.
Shweta GoelCommented:
This type of issues may be occurs due to damaged Send/Receive group within Outlook. You need to create a new Send/Receive group in Outlook. You can also try to recreate your Outlook profile.

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