Please provide the version information for: Thunderbird Lightning any other add-on you use to access the Exchange Calendar

Are all those add-ons enabled in the Add-ons Manager?

Tbird 38.2.0 Lightning 4.0.2 Lookout 1.2.13

Yes, they are all enabled.

The only thing that changed that I know of between Friday and Saturday is a reboot of my laptop.

I don't know if there was an update of tbird in that process. How do I determine when the update to 38.2.0 occured?

It is my understanding that Lightning is unable to natively access an Exchange Calendar. Therefore you do need an additional add-on like Provider for Microsoft Exchange. Lookout is unrelated to Calendar. Please clarify how you actually access the Exchange Calendar.

OK. That may be your understanding but it worked for at least three years.

I don't use any other addons.

I included lookout it was installed original to support MS stuff...

"...LookOut is a plugin which allows Thunderbird to interface with Microsoft's mail tools by decoding metadata and attachments encapsulated/embedded in a TNEF encoded attachment (aka winmail.dat)...."

Something changed between Friday and Saturday. The only thing that is different is I rebooted and I believe I got an update of Tbird. Now it doesn't work.

Timestamp: 8/23/2015 5:50:29 PM Error: Error Parsing ICS: 2152333568 Source File: file:///C:/Users/<me>/AppData/Roaming/Thunderbird/Profiles/<blahblahblah>/calendar-js/calIcsParser.js Line: 129

What's the odds there are problems with the parser - see the many, many errors in the error console... To say nothing of the many parsing errors in warnings. Makes me thing there's an issue with this code, no?

<blablabla>... is not the path to that file. What is so hard about copy and paste that such things slip in.

Something may well have changed. So how about telling us how you have your calendar configured. Is is as a ICS file perhaps? Right click the calendar... what is the Location given? I do think I might have an answer, but without information I am just not prepared to guess anymore.

"...<blablabla>... is not the path to that file. What is so hard about copy and paste that such things slip in...."

It is really interesting to me that the open source community has this support method where top ten contributors and moderators say "your stupid, and unless you stop being stupid I can't help you".

It's not hard to cut and paste. But I cut out what matters in the message and removed information that is none of your business. If that is not good enough for you than why bother answering, especially when your answer is just insulting? Since prior answers provided no enlightment, I did my own perusal of logs and found that message. It's pretty clear in the message that I posted that there IS in fact a parsing error ("Error: Error Parsing ICS: 2152333568") , and simple web searches show this as having been indicated by other users as well. I guess they just didn't bother asking about it here - and I'm not sure I can blame them.

In any event, in case someone actually wants to help, here's how I made the calendar.

On the Calendar tab, I right clicked over the calendar list, and selected "New Calendar". On the Create New Calendar pop up I selected "On the Network". On the next pop up I selected iCalendar. I then went to my office360 UI, and under "Options", "Calendar", "Publish Calendar" I selected "Full Details" and "Save". I then copied the ICS URL and pasted it into the "Location" box in Lightning popup, hit Next and completed the rest of the info (selected the correct email account associated with it, gave the calendar a name,) and finished the creation.

The calendar is created, and turned on in the Calendar listing, but no calendar entries are shown.

I right click the calendar and select "Synchronize Calendars" and nothing happens.

In the past this was always a read only calendar, so I set it as such here. All three buttons on the Edit Calendar menu are selected (Read Only, Show Reminders, Offline Support). Email is correct. Location is correct (it's identical to the value in the Office360 Publish page). Refresh Calendar is set to "Every 30 minutes". Just for fun I set it to "Every 1 minute" to see if there was something goofy with the update, but it did nothing.

As I said in my original post and follow ups, this worked just fine for three years and just stopped working with Lightning 4.0.2. I checked with the exchange admin to determine if something changed on the MS side and the reply was negative.

If there's some other magic that I'm missing I'd love to know about it.

You said it not I. But help requires information. How do you know what you cut was irrelevant? I certainly do not. But that path could tell us if our issue is the calendar add-on (lightning) or another using the same JS file name. If you want to do something infuriating to someone trying to help, redact stuff. Especially thing that are not important. Sure I can see why you might replace the account name with <me> but the rest is just a path.

Troubles with read only ICS network files should not be occurring in release versions of Thunderbird/Lightning however there is a know bug in daily builds.

Please open the error console (ctrl_Shift+J) Clear it now try and synchronize your ical calendar.

What errors appear.? I would assume more than one. and multiples of the same one. Just the unique errors please.

I see no reason to continue discussing with snarky support. I did not ask you personally for your help, and I don't really want it now. I'll just find another solution.

eno123 said

I'll just find another solution.

Please do.