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Outlook iCalendar sync warnings

I just added the URL to the iCalendar to my Outlook 2010 account, and I noticed in the Send/Receive Progress dialog that many warnings are generated for my tasks.

The warnings take the form of:
Task 'Internet Calendar Subscriptions' reported error (0x00040038): The VEVENT, '<TodoistTask>', defined near line <n>, lacks a UID even though it is required by the iCalendar specification. Double-click to open this item.

Everything kinda seems to work, although I haven't tried moving a task around and synchronizing it, yet.

Question: Do I need to worry? Should I wait for these warnings to go away before using this feature, to prevent data loss?

All responses

David Trey staff
Replied on Mar 31, 2013 - 18:24 UTC

Hello Alan,

Please don't worry about these warning, there are some differences in various options of the iCal standard and Outlook may expect a different format for some tasks and notifies you about it, but rest assured - this will not cause any issue especially not data loss (the iCal feed is one-way only so it doesn't send any information to Todoist).

Best regards,

Alan McBee premium
Replied on Mar 31, 2013 - 18:29 UTC

Ah. Thanks. I guess I didn't notice the one-way aspect, so I shouldn't try to use Outlook to manage the dates for tasks. Good to know.

David Trey staff
Replied on Mar 31, 2013 - 18:34 UTC


You can use it as a reference to have your tasks shown on your calendar, but we will soon implement our own calendar view into Todoist which will be more interactive.

Best regards,