I have a local installation of Microsoft Outlook on a pretty standard Windows 10 computer. Outlook removes all of the four Internet Calendars defined in my profile, as shown in the GIF below, every time I:
- View all of my calendars in any of the calendar views; and also
- Open any calendar event on an Exchange account
I have observed this in:
- Safe Mode
- In a "fresh" profile
- As administrator and also not as administrator
- Whether or not they are selected for display.
- The calendars return to availability after Outlook is closed and then reopened, without my needing to edit any account information.
Where to I begin to troubleshoot this? Is there a known behavior or cause? Is there a workaround?
Outlook version 2004 (Build 12730.20270 Click-to-Run)
Windows 10 Pro Version 1909 (but the problem also existed with 1809)
There are five mail accounts configured. The accounts are
- Three Microsoft Exchange accounts
- Two GMail accounts, connected over IMAP
- Four "Internet Calendars", using the google.com "private" ics links provided by Gmail accounts