13,965 questions with Microsoft Exchange-related tags

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9 answers One of the answers was accepted by the question author.

when i run the connect-exchangeonline to connect it it should open a authentications window but it gives the error A window handle must be configured. See https://aka.ms/msal-net-wam#parent-window-handles At C:\Program Files\WindowsPowerShell\Modules\Exc

when i connect-exchangeonline i get this error : A window handle must be configured. See https://aka.ms/msal-net-wam#parent-window-handles At C:\Program…

Microsoft Exchange Online Management
Microsoft Exchange Online Management
Microsoft Exchange Online: A Microsoft email and calendaring hosted service.Management: The act or process of organizing, handling, directing or controlling something.
4,792 questions
asked 2024-12-06T11:41:18.0066667+00:00
Tanuj Saini 55 Reputation points
commented 2025-03-17T13:30:51.83+00:00
WillW 0 Reputation points
0 answers

How to convert an user account with Mailbox to M365 group without losing data

Hello All, Is there a way to convert an existing user mailbox to M365 group without loosing the mailbox data.

Microsoft Exchange Online Management
Microsoft Exchange Online Management
Microsoft Exchange Online: A Microsoft email and calendaring hosted service.Management: The act or process of organizing, handling, directing or controlling something.
4,792 questions
asked 2025-03-17T13:19:50.0666667+00:00
Mani 396 Reputation points
3 answers

The file size limits of .pst and .ost in Outlook Office 365 ?

what is the limit of *.ost or *.pst file in outlook in office 365

Outlook Management
Outlook Management
Outlook: A family of Microsoft email and calendar products.Management: The act or process of organizing, handling, directing or controlling something.
5,672 questions
Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
7,825 questions
asked 2022-03-11T20:17:52.297+00:00
Jorge Santistevan 1 Reputation point
commented 2025-03-17T11:05:09.4833333+00:00
John 0 Reputation points
1 answer

Can't revert from "Mail User" to "User Mailbox"

Hello, One of my users lost complete access to her mailbox, I believe her Office licence got "removed" for 2~ hours then put back but nothing came back to normal... O365 Admin Center shows this message on their profile : Exchange : The…

Microsoft Exchange Hybrid Management
Microsoft Exchange Hybrid Management
Microsoft Exchange: Microsoft messaging and collaboration software.Hybrid Management: Organizing, handling, directing or controlling hybrid deployments.
2,253 questions
asked 2025-03-14T13:05:59.44+00:00
Axel C-FR 0 Reputation points
commented 2025-03-17T10:57:10.92+00:00
Axel C-FR 0 Reputation points
2 answers

Can Exchange server and office 365 coexist?

Hi,  So, to give you an idea of what is our situation. We are a small business with a limited number of users.  Currently we have an exchange e-mail address for all users. We would like to migrate two of our users to office 365, their mail address may…

Microsoft Exchange Online Management
Microsoft Exchange Online Management
Microsoft Exchange Online: A Microsoft email and calendaring hosted service.Management: The act or process of organizing, handling, directing or controlling something.
4,792 questions
asked 2025-03-17T00:19:27.6933333+00:00
Allan Deyoung 0 Reputation points
answered 2025-03-17T09:54:39.0033333+00:00
Bruce Jing-MSFT 10,310 Reputation points Microsoft External Staff
1 answer

Exchange server 2019 CU15 setup command question with best practice

Dear Sir, Customer has Exchange 2019 server running, they want to install CU15. Do it has any suggestion whether it is fine using below command? ```E:\Setup.exe /IAcceptExchangeServerLicenseTerms_DiagnosticDataOFF /Mode:Upgrade /DonotEnableEP Do it…

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
7,825 questions
asked 2025-03-17T04:31:32.5666667+00:00
JOE TAM 101 Reputation points
answered 2025-03-17T08:47:10.5733333+00:00
Sharon Zhao-MSFT 25,361 Reputation points Microsoft External Staff
1 answer

Recent Exchange Calendar Sync Issues with iOS Devices, Exchange 2019 & 9646 Errors

Title: Exchange Calendar Sync Failures for some users with ExchangeIS 9646 App Log Errors Details: We have ~ten or so users that have reported calendar sync issues using Exchange On-Prem, iOS Native Calendar and our MDM (Ivanti MobileIron) over the past…

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
7,825 questions
asked 2025-03-15T20:52:25.56+00:00
KM_MB 0 Reputation points
answered 2025-03-17T08:16:57.8733333+00:00
Tianyi Chang (Shanghai Wicresoft Co Ltd) 1,115 Reputation points Microsoft External Staff
1 answer

Duplicating mails in exchange online in junk folder

Hey, we have a problem with duplicating mails in actually four tenants: Exchange online is duplicating spam mails itself, u can see, it was only once delivered to Exchange Online, but it's delivered to junk mail repeatedly! At some addresses it's only…

Microsoft Exchange Online Management
Microsoft Exchange Online Management
Microsoft Exchange Online: A Microsoft email and calendaring hosted service.Management: The act or process of organizing, handling, directing or controlling something.
4,792 questions
asked 2025-03-16T11:09:51.29+00:00
Bjoern Goetze 0 Reputation points
edited an answer 2025-03-17T07:43:07.66+00:00
Alex Zhang-MSFT 6,390 Reputation points Microsoft External Staff
2 answers

When DelegateSentItemsStyle is set, the Mail is always stuck in Outbox

We saw online on TechNet, that it is possible to send a mail in the name of a shared Mailbox and we tried to save the mail in the sent items in the shared Mailbox, cause we don't need a copy in the primary Mailbox. I attached an image from TechNet,…

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
7,825 questions
asked 2025-03-13T15:17:38.1533333+00:00
Aus der Au Dino 0 Reputation points
commented 2025-03-17T07:08:37.42+00:00
Kaiyue Gong (Shanghai Wicresoft Co Ltd) 710 Reputation points Microsoft External Staff
2 answers

Generic emails with @shadow.outlook.com on Random emails from Andriod devices with On prem mailbox

Hello, One of our users have this recurring issue that a generic email address ending with @shadow.outlook.com appears on the emails, that are sent using outlook app from an Andriod device. The email configured is hosted on an on-prem Exchange 2019…

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
7,825 questions
asked 2025-03-03T08:10:54.6433333+00:00
Ahmed Ali Shahul Hameed 0 Reputation points
commented 2025-03-17T07:03:16.9566667+00:00
Kaiyue Gong (Shanghai Wicresoft Co Ltd) 710 Reputation points Microsoft External Staff
2 answers One of the answers was accepted by the question author.

Outlook.com to Microsoft 365 Migration failed

I'm trying to migrate my Outlook.com email to Microsoft 365 with IMAP Migration, but it keeps failing with this error. Error: ImapAuthenticationException: The username or password for this account is incorrect, or IMAP access is disabled. --> Imap…

Microsoft Exchange Online Management
Microsoft Exchange Online Management
Microsoft Exchange Online: A Microsoft email and calendaring hosted service.Management: The act or process of organizing, handling, directing or controlling something.
4,792 questions
asked 2025-03-14T20:14:53.9133333+00:00
iresh93 41 Reputation points
accepted 2025-03-17T06:53:15.9033333+00:00
iresh93 41 Reputation points
0 answers

Impossible to revert "Mail User" to "User Mailbox"

Hello, One of my users lost complete access to her mailbox, I believe her Office licence got "removed" for 2~ hours then put back but nothing came back to normal... We are using Exchange 2019, Active Directory and Azure. O365 Admin Center shows…

Microsoft Exchange Hybrid Management
Microsoft Exchange Hybrid Management
Microsoft Exchange: Microsoft messaging and collaboration software.Hybrid Management: Organizing, handling, directing or controlling hybrid deployments.
2,253 questions
asked 2025-03-14T08:13:41.5466667+00:00
Axel C-FR 0 Reputation points
commented 2025-03-17T06:46:52.2733333+00:00
Sharon Zhao-MSFT 25,361 Reputation points Microsoft External Staff
1 answer

Outlook for iOS and Android is unable to connect to Exchange 2019

Outlook for iOS and Android is unable to connect to Exchange 2019. After adding the account, an error during authentication is displayed, please try again later. The built-in mail app of the mobile phone can connect, send, and receive emails normally.

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
7,825 questions
asked 2025-03-03T05:56:56.37+00:00
Flash 0 Reputation points
commented 2025-03-17T06:41:59.3166667+00:00
Kaiyue Gong (Shanghai Wicresoft Co Ltd) 710 Reputation points Microsoft External Staff
1 answer

Mitigations Cloud endpoint is not reachable Exchange 2019 Deployment

I receieve below warning during Exchange 2019 deployment Mitigations Cloud endpoint is not…

Microsoft Exchange Hybrid Management
Microsoft Exchange Hybrid Management
Microsoft Exchange: Microsoft messaging and collaboration software.Hybrid Management: Organizing, handling, directing or controlling hybrid deployments.
2,253 questions
asked 2025-03-06T07:37:01.5233333+00:00
ZIYAD MORSI 0 Reputation points
commented 2025-03-17T06:37:09.1066667+00:00
Kaiyue Gong (Shanghai Wicresoft Co Ltd) 710 Reputation points Microsoft External Staff
1 answer

when adding send on behalf to a distribution list i get the message try again later

Hello Please i need your help on this issue. when adding send on behalf to a distribution list i get the message "try again later"

Microsoft Exchange Online Management
Microsoft Exchange Online Management
Microsoft Exchange Online: A Microsoft email and calendaring hosted service.Management: The act or process of organizing, handling, directing or controlling something.
4,792 questions
asked 2025-03-14T19:17:16.69+00:00
James James 20 Reputation points
answered 2025-03-17T06:33:12.1733333+00:00
Kaiyue Gong (Shanghai Wicresoft Co Ltd) 710 Reputation points Microsoft External Staff
1 answer

Users Unable to Access Webmail or Outlook After Upgrading Exchange 2019 to CU15

Hi Everyone, After upgrading Microsoft Exchange Server 2019 to CU15, some users from different locations are facing issues accessing their email through webmail (OWA) and Outlook mobile app. Here are the specific problems we're encountering: Webmail…

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
7,825 questions
asked 2025-03-14T10:39:22.33+00:00
Ahmed Reja 0 Reputation points
answered 2025-03-17T06:28:08.92+00:00
Tianyi Chang (Shanghai Wicresoft Co Ltd) 1,115 Reputation points Microsoft External Staff
1 answer

How to connect Microsoft Exchange Mail Accounts with our web application via Entra App

Dear Microsoft-Team,    we are reaching out regarding authentication issues with our app registration for Microsoft Exchange integration. We want to connect Microsoft Exchange Mail Accounts with our web-application GetGenius, to be able to read and…

Microsoft Exchange
Microsoft Exchange
Microsoft messaging and collaboration software.
688 questions
Azure App Service
Azure App Service
Azure App Service is a service used to create and deploy scalable, mission-critical web apps.
8,468 questions
Microsoft Entra ID
Microsoft Entra ID
A Microsoft Entra identity service that provides identity management and access control capabilities. Replaces Azure Active Directory.
23,669 questions
asked 2025-02-18T13:51:32.23+00:00
Tom Terodde 0 Reputation points
edited a comment 2025-03-17T05:11:37.39+00:00
Kantamsetti Aslesha 80 Reputation points Microsoft External Staff
1 answer

How to fix Delivery has failed to these recipients or groups

I have tried to send email for a company and a person which isn't the first-time sending emails to each other but recently when I try to send emails back to them, I mails bounces back and show the below message. knowing that we have sent emails to each…

Microsoft Exchange Online Management
Microsoft Exchange Online Management
Microsoft Exchange Online: A Microsoft email and calendaring hosted service.Management: The act or process of organizing, handling, directing or controlling something.
4,792 questions
asked 2025-03-15T06:25:49.16+00:00
mohamed omar 0 Reputation points
commented 2025-03-17T03:45:39.76+00:00
mohamed omar 0 Reputation points
1 answer One of the answers was accepted by the question author.

Microsoft’s Exchange & @hotmail.com / @outlook.com domains Spam problem.

The email sent from a Microsoft’s Windows virtual machine using an application written in Microsoft’s Visual Studio and using the Microsoft’s SMTP server received at @yahoo.com and @googlemail.com, but it didn't even end up in the Junk Email at…

Microsoft Exchange
Microsoft Exchange
Microsoft messaging and collaboration software.
688 questions
asked 2025-01-29T20:45:04.3033333+00:00
Goran Salamunićcar 20 Reputation points
commented 2025-03-16T18:54:42.5533333+00:00
Goran Salamunićcar 20 Reputation points
1 answer One of the answers was accepted by the question author.

Mail Flow in Hybrid Deployment When HQ Goes Down

Hello, We currently have a Hybrid Exchange deployment with three Exchange Server 2019 Mailbox servers in our HQ, and we also have a DR site with another three Mailbox servers as part of the same DAG. I already understand how mail flow works between our…

Microsoft Exchange Hybrid Management
Microsoft Exchange Hybrid Management
Microsoft Exchange: Microsoft messaging and collaboration software.Hybrid Management: Organizing, handling, directing or controlling hybrid deployments.
2,253 questions
asked 2025-03-14T11:42:24.38+00:00
Ahmed Essam 180 Reputation points
accepted 2025-03-16T15:32:03.2+00:00
Ahmed Essam 180 Reputation points