A number of MAPI users, some on brand new clean installs of Outlook, are reporting delays of up to several minutes in receiving new emails. However, webmail and mobile devices get them almost immediately.
Users report that even manually clicking Send/Receive in Outlook repeatedly does not bring in the new messages, even though they are present in the server's mailbox and visible in webmail and phone. Then after a minute or more, sometimes several minutes, the message eventually arrives in Outlook. Internet connectivity to the server is confirmed by their ability to log into webmail alongside Outlook on the same PC.
Some messages never arrive into Outlook at all, and that's worse than just a delay.
Doing the protocol reset to trigger a full sync did not improve, nor did deleting the profile from Outlook and starting over.
On very rare occasions we see this in Exchange, and the quick fix is to turn Exchange Cache Mode OFF. But that is not an option with Smartermail. SM requires Exchange Cache mode and errors out if disabled.
Anybody know why, and a possible fix?