Tag Archives: Exchange Online

Thunderbird IMAP an oAuth connect issue with Exchange Online fixed

Posted on 2023-01-06 by guenni

Just a short note: It seems that Microsoft has fixed an issue, that prevents Thunderbird mail client to connect successful with Exchange Online using IMAP and oAuth2 (see my addendum at Thunderbird can't connect via IMAP an oAuth with Exchange Online … Continue reading →

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Thunderbird can't connect via IMAP an oAuth with Exchange Online (outlook.office365.com)

Posted on 2023-01-03 by guenni

[German]At the turn of the year 2022/2023, Microsoft has deactivated Basic Authentication for Exchange Online. This forced Thunderbird users into connection issues with mail servers via IMAP. Thunderbird reports that the user is authenticated  (via oAuth2) but is not connected. … Continue reading →

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How to find weak passwords in Active Directory and eliminate them with PowerShell

[Sponsored Post]Weak or compromised passwords are a known gateway for attackers. If you are able to identify which users in Active Directory (AD) are threatened by this, then PowerShell can help to remedy it. However, PowerShell scripts cannot eliminate basic AD deficits, other tools are needed for this. More ...

Reminder: Basic Authentication in Exchange Online will be switches off in 2023

Posted on 2022-12-27 by guenni

[German]Microsoft has reminded the days that the so-called Basic Authentication in Exchange Online will be phased out and switched off next year. Actually, this has been known for a long time and I assumed that this will already be the … Continue reading →

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Microsoft confirms Outlook bug dropping error 603: Can't configure Exchange Online mailbox

Posted on 2022-10-21 by guenni

[German]Microsoft has published a new support article that addresses an error in the Outlook desktop application. Users receive error 603 "Can't configure Exchange Online mailbox" during autodiscover while configuring a connection to an Exchange Online mailbox. Advertising

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Outlook/Apps failing sending mails? Microsoft has disabled SMTP (July 2022)

Posted on 2022-07-13 by guenni

[German]Very brief information for users and administrators who use Microsoft 365 or Microsoft Office 365 with Exchange Online and are suddenly confronted with the problem that the sending of emails in Microsoft Outlook or in other applications is on strike. … Continue reading →

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Basic Authentication in Exchange Online will be discontinued as of October 2022

Posted on 2022-05-07 by guenni

[German]It was already announced September 2021 that the Basic Authentication in Exchange Online will be deactivated. The cutoff date for this disablement to begin is October 1, 2022. As of May 3, 2022, Microsoft has now reiterated this cutoff date, … Continue reading →

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Exchange Online: Mysterious Outlook Disconnected Error 0x8004011D

Posted on 2022-02-11 by guenni

[German]A German blog reader just notified me about a problem with Microsoft Exchange Online that he was facing suddenly with Microsoft Outlook (from Office 365). A solution that had been running smoothly for years suddenly is causing issues, when synchronizing … Continue reading →

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Issue in Exchange Online (14.12.2021)

Posted on 2021-12-15 by guenni

Short message about Microsoft Exchange Online. Yesterday there seem to have been disturbances that affected users of Exchange Online. Mails that were supposed to be sent via Exchange Online are delayed or get stuck as draft or to be sent. … Continue reading →

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Exchange Online: Enabling Apple Mail App Clients for Modern Authentication

Posted on 2021-10-30 by guenni

[German]Quick note for administrators who manage Apple devices with older iOS versions in an Exchange Online environment. Make sure that these devices are prepared for Modern Authentication, otherwise there will soon be communication problems. No later than October 1, 2022, … Continue reading →

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Outlook connection issues with Exchange Online (07/15/2020)

Posted on 2020-07-16 by guenni

[German]As of July 15, 2020, Outlook users did not only have the problem that the application crashes due to an update. Some users were also no longer able to log on to Exchange Online with Outlook. Advertising

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