I'm a MS partner and see this all the time, across all my clients as well, accessing Outlook from different platforms. I consistently see this issue when moving between Outlook for iOS, macOS and Windows. Sadly this is not a problem related to just IMAP connected clients. If it isn't perceived as enough of a liability and remains broken for long enough it'll make the list for retirement from the product, all together. If something is broken, it will only get fixed if it is creating enough of a liability to the product, whether that be reputationally or legally or otherwise. Nothing is fixed simply because it is broken.
#OUTLOOK 2016 NOT SHOWING INBOX MESSAGES SOFTWARE#
This is how software product development works these days. Microsoft will perceive this as a low value issue and will only look to address it when/if their customers start to make it a higher value issue. However, as I have said, this is definitely not just an IMAP failure but a product-wide failure. Microsoft have been aware of this issue (confirmed through support cases) for a number of years and have always obfuscated the issue and written it off as an IMAP failure combined with "we don't support IMAP as a core function". Click to expand.Sadly this is not a problem related to just IMAP connected clients.