Outlook shows connected, users can also send emails, but for some reason, they cannot receive them.
However, if we use the webmail that we have in place, they can see the incoming emails without any problems.
(more info on: The total size is not computed on the fly, but updated when data is added to and deleted from the store.
The free space is calculated by taking the maximum mailbox size and subtracting the current mailbox size (PR_PROHIBIT_RECIEVE_QUOTA – PR_MESSAGE_SIZE_EXTENDED) information to be displayed, your mailbox must be located on Microsoft Exchange Server 2007 or on Microsoft Exchange Server 2010.
thermometer provides awareness of the size of your mailbox and how far you are from reaching the limit.Outlook reads these values from MAPI properties that are exposed by the Exchange store.