currently we are facing an issue, where Outlook (on PC) sporadically not receiving new Mails. It works perfectly fine via push on mobile devices.
As a workaround we configured "Send and Receive Groups" in Outlook. Indeed this helps (for some time) for the selected folders, but newly added or shared Mailboxes does not "get" new Mails synched "at the moment" the mailserver receives them (sometimes the half of a workday no new Mails getting displayed in Outlook for some random users).
Anyone facing the same issue or a small hint on how to resolve this behavior?