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  • Thanks, Joy. I added the images to the originally posted question. The calendar item shows up in Outlook's calendar. As I mentioned, I do not have a cloud account with Microsoft and I want to avoid creating one in order to minimize my footprint across the various clouds. My original question already described this problem on 2 Windows 10 systems; they are out-of-the-box ASUS and HP laptop OS images, not corporate images. Their Outlook versions were 2019 and 2013 respectively.
    – user2153235
    Commented May 23, 2022 at 19:56
  • I tried a 3rd machine (corporate image + Outlook 2013). It did open Test.msg. The Outlook profile had only an Exchange account; in contrast, the 1st two had only IMAP accounts and a no-email account for the calendar. The problem is not about AkrutoSync, but a Test.msg that can be open by some Outlook installs/accounts and not others. Based on the other tests I desribed, the Test.msg containing the calendar item is correctly formed. Is it possible for such a file to presume the presence of an Exchange server and to rely on its functionality? That would explain what I see.
    – user2153235
    Commented May 23, 2022 at 20:03
  • Based on my knowledge, exchange account will sync mail and calendar automatically from your phone to your outlook via activesync, there is no need 3rd tool to sync calendar, but imap account only sync mails not calendar, I believe it is the reason why exchange account can view calendar successfully. For more details: envisionup.com/blog/…
    – Joy Zhang
    Commented May 25, 2022 at 7:51
  • Thanks for that additional info, Joy. On the 1 system that could open Test.msg, it was just the usual ethernet network between the computer and the server (no phone involved). The phone syncing was simply the background that led to the question of whether a well formed Test.msg containing a calendar item can be constructed in such a way as to require an Exchange server to open it. After the troubleshooting described in my posted question, this is the focus rather than syncing of any sort. None of the systems described (now 4 systems) was syncing Test.msg with either a phone or a server.
    – user2153235
    Commented May 25, 2022 at 13:37