[GH-ISSUE #131] Invalid overridden instance #1029

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opened 2026-03-13 23:55:06 +03:00 by kerem · 18 comments
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Originally created by @hhasert on GitHub (May 12, 2016).
Original GitHub issue: https://github.com/aluxnimm/outlookcaldavsynchronizer/issues/131

I have raised the issue before and based on suggestions removed the ones giving me a sync issue. The problem is that a series recurring meetings is created all the time and individual appointments in the series get enhanced with information in the body or even rescheduled sometimes. Whenever something is done to an instance in the series, I get the error 'Invalid overridden instance'.

Outlook is fine with these changes, but it looks like the caldav server is rejecting them. Is it possible to create a work around by removing the instance from the series and creating an new individual appointment in its place ? It is really annoying and I miss appointments that do not sync.

Originally created by @hhasert on GitHub (May 12, 2016). Original GitHub issue: https://github.com/aluxnimm/outlookcaldavsynchronizer/issues/131 I have raised the issue before and based on suggestions removed the ones giving me a sync issue. The problem is that a series recurring meetings is created all the time and individual appointments in the series get enhanced with information in the body or even rescheduled sometimes. Whenever something is done to an instance in the series, I get the error 'Invalid overridden instance'. Outlook is fine with these changes, but it looks like the caldav server is rejecting them. Is it possible to create a work around by removing the instance from the series and creating an new individual appointment in its place ? It is really annoying and I miss appointments that do not sync.
kerem closed this issue 2026-03-13 23:55:11 +03:00
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@aluxnimm commented on GitHub (May 12, 2016):

question is why it is invalid. what caldav server? can you post an example event ics file that causes this and the corresponding sync report with the error.

<!-- gh-comment-id:218795953 --> @aluxnimm commented on GitHub (May 12, 2016): question is why it is invalid. what caldav server? can you post an example event ics file that causes this and the corresponding sync report with the error.
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@hhasert commented on GitHub (May 12, 2016):

I am using caldavd on the raspberry Pi (calendarserver_3.2+dfsg-5+b2_armhf.deb ). I think it is based on the sources at http://calendarserver.org/.

<!-- gh-comment-id:218847059 --> @hhasert commented on GitHub (May 12, 2016): I am using caldavd on the raspberry Pi (calendarserver_3.2+dfsg-5+b2_armhf.deb ). I think it is based on the sources at http://calendarserver.org/.
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@hhasert commented on GitHub (May 12, 2016):

The problem is that the information in the ics files is confidential (contains company email addresses and such), so I cannot post it here. I can send you a copy to your email if you like,

<!-- gh-comment-id:218848210 --> @hhasert commented on GitHub (May 12, 2016): The problem is that the information in the ics files is confidential (contains company email addresses and such), so I cannot post it here. I can send you a copy to your email if you like,
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@hhasert commented on GitHub (May 12, 2016):

I get a sync report on 3 failed items and I see them also on the calendarserver :

2016-05-12 18:48:01+0000 [-] [caldav-0] [-] [txdav.caldav.datastore.index_file#error] Invalid instance 20160426T110000Z when indexing aabd4444-0a43-494a-849c-b84a5fb5d06a.ics in <txdav.caldav.datastore.file.CalendarStubResource object at 0x7509ea90>
2016-05-12 18:48:03+0000 [-] [caldav-0] [-] [txdav.caldav.datastore.index_file#error] Invalid instance 20160426T080000Z when indexing 84764b18-d325-45e3-9891-32ddfb6778c7.ics in <txdav.caldav.datastore.file.CalendarStubResource object at 0x7505d930>
2016-05-12 18:48:03+0000 [-] [caldav-0] [-] [txdav.caldav.datastore.index_file#error] Invalid instance 20160509T073000Z when indexing bb2bc433-a086-455e-be47-8c344a3ab01a.ics in <txdav.caldav.datastore.file.CalendarStubResource object at 0x75011630>

<!-- gh-comment-id:218850479 --> @hhasert commented on GitHub (May 12, 2016): I get a sync report on 3 failed items and I see them also on the calendarserver : 2016-05-12 18:48:01+0000 [-] [caldav-0] [-] [txdav.caldav.datastore.index_file#error] Invalid instance 20160426T110000Z when indexing aabd4444-0a43-494a-849c-b84a5fb5d06a.ics in <txdav.caldav.datastore.file.CalendarStubResource object at 0x7509ea90> 2016-05-12 18:48:03+0000 [-] [caldav-0] [-] [txdav.caldav.datastore.index_file#error] Invalid instance 20160426T080000Z when indexing 84764b18-d325-45e3-9891-32ddfb6778c7.ics in <txdav.caldav.datastore.file.CalendarStubResource object at 0x7505d930> 2016-05-12 18:48:03+0000 [-] [caldav-0] [-] [txdav.caldav.datastore.index_file#error] Invalid instance 20160509T073000Z when indexing bb2bc433-a086-455e-be47-8c344a3ab01a.ics in <txdav.caldav.datastore.file.CalendarStubResource object at 0x75011630>
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@aluxnimm commented on GitHub (May 12, 2016):

just replace the email adresses and names

<!-- gh-comment-id:218851578 --> @aluxnimm commented on GitHub (May 12, 2016): just replace the email adresses and names
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@hhasert commented on GitHub (May 12, 2016):

From where do you want the ics file ?

<!-- gh-comment-id:218852006 --> @hhasert commented on GitHub (May 12, 2016): From where do you want the ics file ?
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@aluxnimm commented on GitHub (May 12, 2016):

when possible from outlook and from the server and the sync report

<!-- gh-comment-id:218852309 --> @aluxnimm commented on GitHub (May 12, 2016): when possible from outlook and from the server and the sync report
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@hhasert commented on GitHub (May 12, 2016):

I open the sync report, click on the first error and send that as ics file to my email. Would that give you the outlook one ?

<!-- gh-comment-id:218853100 --> @hhasert commented on GitHub (May 12, 2016): I open the sync report, click on the first error and send that as ics file to my email. Would that give you the outlook one ?
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@aluxnimm commented on GitHub (May 12, 2016):

when you click on server Id it is the server one when you click on outlook id the corresponding outlook appointment opens and you can export/send it as an ics file from outlook

<!-- gh-comment-id:218853700 --> @aluxnimm commented on GitHub (May 12, 2016): when you click on server Id it is the server one when you click on outlook id the corresponding outlook appointment opens and you can export/send it as an ics file from outlook
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@hhasert commented on GitHub (May 12, 2016):

Server id is empty, only outlook id has a value

<!-- gh-comment-id:218854412 --> @hhasert commented on GitHub (May 12, 2016): Server id is empty, only outlook id has a value
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@aluxnimm commented on GitHub (May 12, 2016):

ok then only the outlook part. thought it was a modification abd not a newly created item.

<!-- gh-comment-id:218855003 --> @aluxnimm commented on GitHub (May 12, 2016): ok then only the outlook part. thought it was a modification abd not a newly created item.
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@hhasert commented on GitHub (May 12, 2016):

BEGIN:VCALENDAR
PRODID:-//Microsoft Corporation//Outlook 14.0 MIMEDIR//EN
VERSION:2.0
METHOD:REQUEST
X-MS-OLK-FORCEINSPECTOROPEN:TRUE
BEGIN:VTIMEZONE
TZID:W. Europe Standard Time
BEGIN:STANDARD
DTSTART:16011028T030000
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
END:STANDARD
BEGIN:DAYLIGHT
DTSTART:16010325T020000
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=3
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
END:DAYLIGHT
END:VTIMEZONE
BEGIN:VEVENT
ATTENDEE;CN="removed";RSVP=TRUE:mailto:removed
Other attendees removed
CLASS:PUBLIC
CREATED:20160512T185709Z
DESCRIPTION:removed\n
DTEND;TZID="W. Europe Standard Time":20160419T140000
DTSTAMP:20160503T104410Z
DTSTART;TZID="W. Europe Standard Time":20160419T130000
EXDATE;TZID="W. Europe Standard Time":20160419T130000
LAST-MODIFIED:20160512T185709Z
LOCATION:Webex / Call
ORGANIZER;CN="removed":mailto:removed
PRIORITY:5
RRULE:FREQ=WEEKLY;COUNT=11;BYDAY=TU
SEQUENCE:3
SUMMARY;LANGUAGE=nl:Subject of the meeting...
TRANSP:OPAQUE
UID:removed
X-ALT-DESC;removed
X-MICROSOFT-CDO-BUSYSTATUS:BUSY
X-MICROSOFT-CDO-IMPORTANCE:1
X-MICROSOFT-CDO-INTENDEDSTATUS:BUSY
X-MICROSOFT-DISALLOW-COUNTER:FALSE
X-MS-OLK-APPTSEQTIME:20160412T064833Z
X-MS-OLK-CONFTYPE:0
BEGIN:VALARM
TRIGGER:-PT15M
ACTION:DISPLAY
DESCRIPTION:Reminder
END:VALARM
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
CREATED:20160512T185709Z
DESCRIPTION:26/4 > ** removed ** \n
DTEND:20160426T120000Z
DTSTAMP:20160426T090756Z
DTSTART:20160426T110000Z
LAST-MODIFIED:20160512T185709Z
PRIORITY:5
RECURRENCE-ID:20160426T110000Z
SEQUENCE:2
TRANSP:OPAQUE
UID:removed
X-ALT-DESC;removed
X-MICROSOFT-CDO-BUSYSTATUS:BUSY
X-MICROSOFT-CDO-IMPORTANCE:1
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
CREATED:20160512T185709Z
DESCRIPTION:removed/n
DTEND:20160503T120000Z
DTSTAMP:20160503T104412Z
DTSTART:20160503T110000Z
LAST-MODIFIED:20160512T185709Z
LOCATION:Webex / Call
PRIORITY:5
RECURRENCE-ID:20160503T110000Z
SEQUENCE:4
SUMMARY;LANGUAGE=nl:Subject of the Meeting....
TRANSP:OPAQUE
UID:removed
X-ALT-DESC;BEGIN:VCALENDAR
PRODID:-//Microsoft Corporation//Outlook 14.0 MIMEDIR//EN
VERSION:2.0
METHOD:REQUEST
X-MS-OLK-FORCEINSPECTOROPEN:TRUE
BEGIN:VTIMEZONE
TZID:W. Europe Standard Time
BEGIN:STANDARD
DTSTART:16011028T030000
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
END:STANDARD
BEGIN:DAYLIGHT
DTSTART:16010325T020000
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=3
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
END:DAYLIGHT
END:VTIMEZONE
BEGIN:VEVENT
ATTENDEE;CN="removed";RSVP=TRUE:mailto:removed
Other attendees removed
CLASS:PUBLIC
CREATED:20160512T185709Z
DESCRIPTION:removed\n
DTEND;TZID="W. Europe Standard Time":20160419T140000
DTSTAMP:20160503T104410Z
DTSTART;TZID="W. Europe Standard Time":20160419T130000
EXDATE;TZID="W. Europe Standard Time":20160419T130000
LAST-MODIFIED:20160512T185709Z
LOCATION:Webex / Call
ORGANIZER;CN="removed":mailto:removed
PRIORITY:5
RRULE:FREQ=WEEKLY;COUNT=11;BYDAY=TU
SEQUENCE:3
SUMMARY;LANGUAGE=nl:Subject of the meeting....
TRANSP:OPAQUE
UID:removed
X-ALT-DESC;removed
X-MICROSOFT-CDO-BUSYSTATUS:BUSY
X-MICROSOFT-CDO-IMPORTANCE:1
X-MICROSOFT-CDO-INTENDEDSTATUS:BUSY
X-MICROSOFT-DISALLOW-COUNTER:FALSE
X-MS-OLK-APPTSEQTIME:20160412T064833Z
X-MS-OLK-CONFTYPE:0
BEGIN:VALARM
TRIGGER:-PT15M
ACTION:DISPLAY
DESCRIPTION:Reminder
END:VALARM
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
CREATED:20160512T185709Z
DESCRIPTION:26/4 > ** removed ** \n
DTEND:20160426T120000Z
DTSTAMP:20160426T090756Z
DTSTART:20160426T110000Z
LAST-MODIFIED:20160512T185709Z
PRIORITY:5
RECURRENCE-ID:20160426T110000Z
SEQUENCE:2
TRANSP:OPAQUE
UID:removed
X-ALT-DESC;removed
X-MICROSOFT-CDO-BUSYSTATUS:BUSY
X-MICROSOFT-CDO-IMPORTANCE:1
END:VEVENT
BEGIN:VEVENT
CLASS:PUBLIC
CREATED:20160512T185709Z
DESCRIPTION:removed/n
DTEND:20160503T120000Z
DTSTAMP:20160503T104412Z
DTSTART:20160503T110000Z
LAST-MODIFIED:20160512T185709Z
LOCATION:Webex / Call
PRIORITY:5
RECURRENCE-ID:20160503T110000Z
SEQUENCE:4
SUMMARY;LANGUAGE=nl:Subject of the meeting....
TRANSP:OPAQUE
UID:removed
X-ALT-DESC;removed
X-MICROSOFT-CDO-BUSYSTATUS:BUSY
X-MICROSOFT-CDO-IMPORTANCE:1
X-MICROSOFT-CDO-INTENDEDSTATUS:BUSY
X-MICROSOFT-DISALLOW-COUNTER:FALSE
X-MS-OLK-APPTLASTSEQUENCE:3
X-MS-OLK-APPTSEQTIME:20160412T064833Z
X-MS-OLK-AUTOSTARTCHECK:FALSE
X-MS-OLK-CONFTYPE:0
BEGIN:VALARM
TRIGGER:-PT15M
ACTION:DISPLAY
DESCRIPTION:Reminder
END:VALARM
END:VEVENT
END:VCALENDAR

X-MICROSOFT-CDO-BUSYSTATUS:BUSY
X-MICROSOFT-CDO-IMPORTANCE:1
X-MICROSOFT-CDO-INTENDEDSTATUS:BUSY
X-MICROSOFT-DISALLOW-COUNTER:FALSE
X-MS-OLK-APPTLASTSEQUENCE:3
X-MS-OLK-APPTSEQTIME:20160412T064833Z
X-MS-OLK-AUTOSTARTCHECK:FALSE
X-MS-OLK-CONFTYPE:0
BEGIN:VALARM
TRIGGER:-PT15M
ACTION:DISPLAY
DESCRIPTION:Reminder
END:VALARM
END:VEVENT
END:VCALENDAR

<!-- gh-comment-id:218856458 --> @hhasert commented on GitHub (May 12, 2016): BEGIN:VCALENDAR PRODID:-//Microsoft Corporation//Outlook 14.0 MIMEDIR//EN VERSION:2.0 METHOD:REQUEST X-MS-OLK-FORCEINSPECTOROPEN:TRUE BEGIN:VTIMEZONE TZID:W. Europe Standard Time BEGIN:STANDARD DTSTART:16011028T030000 RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10 TZOFFSETFROM:+0200 TZOFFSETTO:+0100 END:STANDARD BEGIN:DAYLIGHT DTSTART:16010325T020000 RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=3 TZOFFSETFROM:+0100 TZOFFSETTO:+0200 END:DAYLIGHT END:VTIMEZONE BEGIN:VEVENT ATTENDEE;CN="**removed**";RSVP=TRUE:mailto:**removed** **Other attendees removed** CLASS:PUBLIC CREATED:20160512T185709Z DESCRIPTION:**removed**\n DTEND;TZID="W. Europe Standard Time":20160419T140000 DTSTAMP:20160503T104410Z DTSTART;TZID="W. Europe Standard Time":20160419T130000 EXDATE;TZID="W. Europe Standard Time":20160419T130000 LAST-MODIFIED:20160512T185709Z LOCATION:Webex / Call ORGANIZER;CN="**removed**":mailto:**removed** PRIORITY:5 RRULE:FREQ=WEEKLY;COUNT=11;BYDAY=TU SEQUENCE:3 SUMMARY;LANGUAGE=nl:Subject of the meeting... TRANSP:OPAQUE UID:**removed** X-ALT-DESC;**removed** X-MICROSOFT-CDO-BUSYSTATUS:BUSY X-MICROSOFT-CDO-IMPORTANCE:1 X-MICROSOFT-CDO-INTENDEDSTATUS:BUSY X-MICROSOFT-DISALLOW-COUNTER:FALSE X-MS-OLK-APPTSEQTIME:20160412T064833Z X-MS-OLK-CONFTYPE:0 BEGIN:VALARM TRIGGER:-PT15M ACTION:DISPLAY DESCRIPTION:Reminder END:VALARM END:VEVENT BEGIN:VEVENT CLASS:PUBLIC CREATED:20160512T185709Z DESCRIPTION:26/4 > *\* removed *\* \n DTEND:20160426T120000Z DTSTAMP:20160426T090756Z DTSTART:20160426T110000Z LAST-MODIFIED:20160512T185709Z PRIORITY:5 RECURRENCE-ID:20160426T110000Z SEQUENCE:2 TRANSP:OPAQUE UID:**removed** X-ALT-DESC;**removed** X-MICROSOFT-CDO-BUSYSTATUS:BUSY X-MICROSOFT-CDO-IMPORTANCE:1 END:VEVENT BEGIN:VEVENT CLASS:PUBLIC CREATED:20160512T185709Z DESCRIPTION:**removed**/n DTEND:20160503T120000Z DTSTAMP:20160503T104412Z DTSTART:20160503T110000Z LAST-MODIFIED:20160512T185709Z LOCATION:Webex / Call PRIORITY:5 RECURRENCE-ID:20160503T110000Z SEQUENCE:4 SUMMARY;LANGUAGE=nl:Subject of the Meeting.... TRANSP:OPAQUE UID:**removed** X-ALT-DESC;BEGIN:VCALENDAR PRODID:-//Microsoft Corporation//Outlook 14.0 MIMEDIR//EN VERSION:2.0 METHOD:REQUEST X-MS-OLK-FORCEINSPECTOROPEN:TRUE BEGIN:VTIMEZONE TZID:W. Europe Standard Time BEGIN:STANDARD DTSTART:16011028T030000 RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10 TZOFFSETFROM:+0200 TZOFFSETTO:+0100 END:STANDARD BEGIN:DAYLIGHT DTSTART:16010325T020000 RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=3 TZOFFSETFROM:+0100 TZOFFSETTO:+0200 END:DAYLIGHT END:VTIMEZONE BEGIN:VEVENT ATTENDEE;CN="**removed**";RSVP=TRUE:mailto:**removed** **Other attendees removed** CLASS:PUBLIC CREATED:20160512T185709Z DESCRIPTION:**removed**\n DTEND;TZID="W. Europe Standard Time":20160419T140000 DTSTAMP:20160503T104410Z DTSTART;TZID="W. Europe Standard Time":20160419T130000 EXDATE;TZID="W. Europe Standard Time":20160419T130000 LAST-MODIFIED:20160512T185709Z LOCATION:Webex / Call ORGANIZER;CN="**removed**":mailto:**removed** PRIORITY:5 RRULE:FREQ=WEEKLY;COUNT=11;BYDAY=TU SEQUENCE:3 SUMMARY;LANGUAGE=nl:Subject of the meeting.... TRANSP:OPAQUE UID:**removed** X-ALT-DESC;**removed** X-MICROSOFT-CDO-BUSYSTATUS:BUSY X-MICROSOFT-CDO-IMPORTANCE:1 X-MICROSOFT-CDO-INTENDEDSTATUS:BUSY X-MICROSOFT-DISALLOW-COUNTER:FALSE X-MS-OLK-APPTSEQTIME:20160412T064833Z X-MS-OLK-CONFTYPE:0 BEGIN:VALARM TRIGGER:-PT15M ACTION:DISPLAY DESCRIPTION:Reminder END:VALARM END:VEVENT BEGIN:VEVENT CLASS:PUBLIC CREATED:20160512T185709Z DESCRIPTION:26/4 > *\* removed *\* \n DTEND:20160426T120000Z DTSTAMP:20160426T090756Z DTSTART:20160426T110000Z LAST-MODIFIED:20160512T185709Z PRIORITY:5 RECURRENCE-ID:20160426T110000Z SEQUENCE:2 TRANSP:OPAQUE UID:**removed** X-ALT-DESC;**removed** X-MICROSOFT-CDO-BUSYSTATUS:BUSY X-MICROSOFT-CDO-IMPORTANCE:1 END:VEVENT BEGIN:VEVENT CLASS:PUBLIC CREATED:20160512T185709Z DESCRIPTION:**removed**/n DTEND:20160503T120000Z DTSTAMP:20160503T104412Z DTSTART:20160503T110000Z LAST-MODIFIED:20160512T185709Z LOCATION:Webex / Call PRIORITY:5 RECURRENCE-ID:20160503T110000Z SEQUENCE:4 SUMMARY;LANGUAGE=nl:Subject of the meeting.... TRANSP:OPAQUE UID:**removed** X-ALT-DESC;**removed** X-MICROSOFT-CDO-BUSYSTATUS:BUSY X-MICROSOFT-CDO-IMPORTANCE:1 X-MICROSOFT-CDO-INTENDEDSTATUS:BUSY X-MICROSOFT-DISALLOW-COUNTER:FALSE X-MS-OLK-APPTLASTSEQUENCE:3 X-MS-OLK-APPTSEQTIME:20160412T064833Z X-MS-OLK-AUTOSTARTCHECK:FALSE X-MS-OLK-CONFTYPE:0 BEGIN:VALARM TRIGGER:-PT15M ACTION:DISPLAY DESCRIPTION:Reminder END:VALARM END:VEVENT END:VCALENDAR X-MICROSOFT-CDO-BUSYSTATUS:BUSY X-MICROSOFT-CDO-IMPORTANCE:1 X-MICROSOFT-CDO-INTENDEDSTATUS:BUSY X-MICROSOFT-DISALLOW-COUNTER:FALSE X-MS-OLK-APPTLASTSEQUENCE:3 X-MS-OLK-APPTSEQTIME:20160412T064833Z X-MS-OLK-AUTOSTARTCHECK:FALSE X-MS-OLK-CONFTYPE:0 BEGIN:VALARM TRIGGER:-PT15M ACTION:DISPLAY DESCRIPTION:Reminder END:VALARM END:VEVENT END:VCALENDAR
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@hhasert commented on GitHub (May 12, 2016):

Took quite a bit of cleansing though ;-)

<!-- gh-comment-id:218856650 --> @hhasert commented on GitHub (May 12, 2016): Took quite a bit of cleansing though ;-)
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@hhasert commented on GitHub (May 12, 2016):

I think the organizer creates it and then modifies it with the agenda. I see most issues when instances are modified after the sequence is created.

<!-- gh-comment-id:218857212 --> @hhasert commented on GitHub (May 12, 2016): I think the organizer creates it and then modifies it with the agenda. I see most issues when instances are modified after the sequence is created.
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@aluxnimm commented on GitHub (May 12, 2016):

can you check if the setting create events on server in UTC in event mapping configuration makes any difference?

<!-- gh-comment-id:218875098 --> @aluxnimm commented on GitHub (May 12, 2016): can you check if the setting create events on server in UTC in event mapping configuration makes any difference?
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@hhasert commented on GitHub (May 12, 2016):

It was checked during the errors, but I now unchecked it and I do not seem to get the error. I will experiment a bit.

<!-- gh-comment-id:218878364 --> @hhasert commented on GitHub (May 12, 2016): It was checked during the errors, but I now unchecked it and I do not seem to get the error. I will experiment a bit.
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@aluxnimm commented on GitHub (May 12, 2016):

better leave it unchecked then. it is only needed for servers which have problems with windows timezone definitions and causes also problems with dst changes.

<!-- gh-comment-id:218879221 --> @aluxnimm commented on GitHub (May 12, 2016): better leave it unchecked then. it is only needed for servers which have problems with windows timezone definitions and causes also problems with dst changes.
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@hhasert commented on GitHub (May 12, 2016):

Ok, it seems to be the cause of the errors. I will leave it unchecked and see if the errors do not return. When I check it and sync I immediately get the error, uncheck and status is ok. So that must be it. Thanks !! It solves a lot of curses every 30 minutes on a sync.

<!-- gh-comment-id:218880283 --> @hhasert commented on GitHub (May 12, 2016): Ok, it seems to be the cause of the errors. I will leave it unchecked and see if the errors do not return. When I check it and sync I immediately get the error, uncheck and status is ok. So that must be it. Thanks !! It solves a lot of curses every 30 minutes on a sync.
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starred/outlookcaldavsynchronizer#1029
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