Problems with outlook.de Microsoft 365 Account

[Christian Kemmer]

Hello,

I'm new to Calengoo. I have connected my gmail and my CalDav-Account succesfully.

Now, I want to connect my Microsoft 365 account (@outlook.de). It only works with "Office 365 (Graph API)", not with exchange, not with "Office 365". The connection works, but no calender is shown.

How can I use my outlook.de-Account correctly to see my calenders there?

Best regards

Christian Kemmer

[CalenGoo Support]

Hi,

thank you for your email! "Graph API" is the newest sync method Microsoft offers and should usually work fine. Does it show any errors when you try to sync that account? Is it a private Microsoft 365 account or is it maybe restricted somehow?

Kind regards

Dominique Gunia

[Christian Kemmer]

Hello,

I have just deleted this account in CalenGoo and added it again. Same result. It is a private account (Microsoft 365 family) without any restrictions which works fine in Outlook classic. 

There should be two calenders in this account: My own calender and a shared calender, shared by another Microsoft 365 family account.

I see no errors wegen I try to sync this account. I just click on "Sync" and all accounts are synced.

Is there any possibilty to get a log file?

Best regards

Christian Kemmer

[CalenGoo Support]

Hi,

yes, there are log files under "Settings > Show Logs". The part where the sync starts should start with "SyncCalendars <accountname>". Afterward you should see how many calendars were received or maybe you can see an error in the log. What can you find there?

Kind regards

Dominique Gunia

[Christian Kemmer]

Hello,

In the log, first error seems to be there:

INFORMATION: getOpenFolder end
Dez 12, 2025 10:33:50 AM com.calengoo.desktop.network.imap.IMAPSync a
INFORMATION: Label
Dez 12, 2025 10:33:50 AM com.calengoo.desktop.network.imap.IMAPSync a
INFORMATION: oldUidValidity: 2 newUidValidity: 2
Dez 12, 2025 10:33:50 AM com.calengoo.desktop.network.imap.IMAPSync a
INFORMATION: Existing emails
Dez 12, 2025 10:33:50 AM  

SCHWERWIEGEND: java.io.IOException: Empty calendar group list received!
Dez 12, 2025 10:33:50 AM  
SCHWERWIEGEND: at com.calengoo.common.exchange.s.b(ExchangeGraphCalendarSyncManager.kt:468)
Dez 12, 2025 10:33:50 AM  
SCHWERWIEGEND: at com.calengoo.common.exchange.s.a(ExchangeGraphCalendarSyncManager.kt:40)
Dez 12, 2025 10:33:50 AM  
SCHWERWIEGEND: at com.calengoo.desktop.controller.h.a(CalendarSyncManager.java:284)
Dez 12, 2025 10:33:50 AM  
SCHWERWIEGEND: at java.lang.Thread.run(Thread.java:750)

Afterwards, several errors like this appear:

SCHWERWIEGEND: java.sql.SQLDataException: A truncation error was encountered trying to shrink VARCHAR '<SpoOther-c1c0b0f9-ba7e-424a-92fc-62d205ce6e1b,c1c0b0f9-ba7e&' to length 255.

I sent the full log via Mail.

Best regards,

Christian Kemmer

[CalenGoo Support]

Hi,

I have made some changes and uploaded a new beta version. Please set "Settings > Update channel" to "Beta" and click on "Check for updates" to see and download the update. Are you using Windows?

Kind regards

Dominique Gunia

[Christian Kemmer]

Hello,

thanks for your fast answer.

Yes, I'm using Windows and updated to the latest beta, deleted the Microsoft 365 account and added it again. There are still 0 calendars, I sent the log file.

First error seems to be

INFORMATION: Reusing access token accounts
Dez 12, 2025 11:41:46 AM com.calengoo.desktop.network.imap.IMAPSync a
INFORMATION: getOpenFolder end
Dez 12, 2025 11:41:46 AM com.calengoo.desktop.network.imap.IMAPSync a
INFORMATION: Label
Dez 12, 2025 11:41:46 AM com.calengoo.desktop.network.imap.IMAPSync a

INFORMATION: oldUidValidity: 2 newUidValidity: 2

Dez 12, 2025 11:41:46 AM com.calengoo.desktop.network.imap.IMAPSync a
INFORMATION: Existing emails
Dez 12, 2025 11:41:46 AM a.a.a b
INFORMATION: No calendar groups found, using direct calendar endpoint
Dez 12, 2025 11:41:46 AM b e
INFORMATION: Reusing access token accounts
Dez 12, 2025 11:41:46 AM com.calengoo.desktop.network.imap.IMAPSync a
INFORMATION: Load with uid
Dez 12, 2025 11:41:47 AM  
SCHWERWIEGEND: java.io.IOException: Empty calendar list received!
Dez 12, 2025 11:41:47 AM  
SCHWERWIEGEND: at com.calengoo.common.exchange.s.b(ExchangeGraphCalendarSyncManager.kt:486)
Dez 12, 2025 11:41:47 AM  
SCHWERWIEGEND: at com.calengoo.common.exchange.s.a(ExchangeGraphCalendarSyncManager.kt:40)
Dez 12, 2025 11:41:47 AM  
SCHWERWIEGEND: at com.calengoo.desktop.controller.h.a(CalendarSyncManager.java:284)
Dez 12, 2025 11:41:47 AM  
SCHWERWIEGEND: at java.lang.Thread.run(Thread.java:750)
Dez 12, 2025 11:41:47 AM com.calengoo.desktop.network.imap.IMAPSync a
INFORMATION: Removing emails
Dez 12, 2025 11:41:47 AM com.calengoo.desktop.network.imap.IMAPSync a
INFORMATION: IMAP full sync stop
Dez 12, 2025 11:41:47 AM com.calengoo.desktop.network.imap.IMAPSync a
INFORMATION: Caching emails

Thanks for your support.

Best regards

Christian Kemmer

[CalenGoo Support]

Hi,

I am sorry that it still doesn't work! I have send you an email and uploaded another version, 1022.

Kind regards

Dominique Gunia

[Christian Kemmer]

Hello,

thanks a lot to Dominique. Now, with beta 1023, everything works fine and CalenGoo Desktop (Windows) synchronizes with Microsoft 365.

[CalenGoo Support]

Great, thank you for reporting this problem! If you have any other problems or questions please don't hesitate to contact me again!

Kind regards

Dominique