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:

1. View all of my calendars in any of the calendar views; and also
2. 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

1 Answer

Is this a problem that has only recently occurred? If so, what specific operations did you do before this problem occurred?

According to your description,it seems that this issue may be related to your four Internet Calendars. To further confirm your issue, you may try to temporarily remove these four Internet Calendars and add another Internet Calendar to see if the issue can be reproduced.

7

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