Hi Ian, Is there any particular reason I should upgrade to 9.81 and not 10.18 as I indicated was going to do? Besides upgrading the server to 10.18 and the clients to 2.74, what can we do to nail this down and correct it? If I upgrade a handful of clients to 2.74 and a few days later they have this ...

This is an ongoing issue for me as well, actually for years. I believe it has been here since we first moved to MailEnable, though it might've been introduced with the upgrade to Win10Pro. I can't be 100% certain here. A random email message simply does not show for up for a user until Outlook is cl...