Tag Archives: Exchange Online

Issues with new 365 tenant/accounts – Migration Exchange 2013 to Exchange Online

Posted on 2023-04-08 by guenni

[German]This month, support for Microsoft Exchange 2013 expires, so administrators are facing a switch to Exchange 2019 or Exchange Online. A blog reader emailed me the other day because he ran into problems when migrating customers from Microsoft Exchange 2013 … Continue reading →

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Deprecated Remote PowerShell gets reprieve in Exchange Online

Posted on 2023-03-30 by guenni

[German]To force administrators of Exchange instances to the more secure PowerShell v3 modules, Microsoft plans to discontinue Remote PowerShell (RPS) in Exchange Online. It was supposed to be disabled for all customers starting June 2023 – and already on April … Continue reading →

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Exchange Online blocks mail from on-premises Exchange servers with vulnerabilities

Posted on 2023-03-28 by guenni

[English]Microsoft has just unveiled a new security policy for Exchange Online that can block the acceptance of email from insecure on-premises Exchange servers (in hybrid environments). The administrators in question will receive a notification that the on-premises Exchange server is … Continue reading →

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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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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.

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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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