Office 365 calendar events completely lost

[melyouz]

Your environment

TbSync version: tbsync-4.3-tb
Thunderbird version: 102.11.0

Expected behavior

...

Actual behavior

Office 365 calendar getting completely lost and the events are not listed anywhere (MS Teams, Web App, ...).

Steps to reproduce

I don't really know how to reproduce it and I've already uninstalled the addon as I don't want to lose once again all my calendar events.

[ThomasStruller]

the same happend to me.

[jobisoft]

Did you sync the calendar or set up an auto-sync every x minutes? Have you seen the events being synced into O365?

[tfft]

I too see the same issue (using TB-115.5.2, TbSync-4.8, Provider-for-Exchange-ActiveSync-4.8). I enable tbSync to use Exchange ActiveSync (EAS) and end-up seeing thousands of errors in the "Activity Manager" and end-up LOSING all my calendar entries even if I go back to outlook, everything is simply GONE, its as though all the calendar entries were pulled down and removed from the server (a huge no-no). Here is a sample of an error, I've modified minor fields below to obfuscate details, if they matter I'd be more than happy to share them privately (hope this helps !). This is a huge showstopper for me (& others I'm sure).

From: Microsoft Exchange Server
Subject: Retrieval using IMAP protocol failed for the following message: 12753

The server couldn't retrieve the following message:

Subject: "Tool Walkthrough Meeting"
From: "Bob Smith" ("/o=ExchangeLabs/ou=Exchange Administrative Group (FYKUBOHF65FPDLT)/cn=Recipients/cn=7ac2ec5ef72s42d84a59cbe2034f1892-BoB.Smith")
Sent date: 2/16/2023 9:52:14 AM

The message hasn't been deleted. You might be able to view it using either Outlook or Outlook Web App. You can also contact the sender to find out what the message says.

[jobisoft]

What server address are you using? How did you set up the account in TbSync? This does not look like en error from an EAS account, but from a EWS account. Strange.

[tfft]

I’ve disabled TbSync, at the moment, as I spent 3+ hours rebuilding my calendar (had to revisit my outlook “Deleted Items” calendar entries and “accept” again without sending out emails for those items to reshow-up in my calendar). My TbSync, to your question, was setup following the simple prompts, nothing elaborate, entered domain, username and that’s it from what I remember. Here are some settings – if you need something specific, please let me know.

Server Settings

• Server Type: IMAP Server Type
• Server Name: outlook.office365.com - Port: 993
• User Name: [email protected]
  Security Settings
• Connection Security: SSL/TLS
• Authentication Method: OAuth2

TbSync Account Settings

• Description: MyCalendar
• User Name: [email protected]
• Server Address: outlook.office365.com
• [Ticked] Use secure connection (connect via https)
• ActiveSync Version: best available
  Options
• Nothing selected (vanilla/default settings)