unable to add additional email address
Hi All, I am using an Exchange 2016 hybrid environment. We create users on-prem and then migrate them to Exchange Online. I have a user, ******@contoso.com, and I want to add an additional email address, ******@contoso.com, to this user. When I execute…
Why does Microsoft Enterprise Applications appear to be broken?
I'm trying to authorize an application to my Exchange Online subscription, but when I attempt to do so, the authorization never completes (just hangs with the animation at the top of the page). In an attempt to troubleshoot, I navigate to the enterprise…
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…
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…

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…
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…
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"
How to get the list of accounts with General as Employee number along with Mailbox and OneDrvie quota
Hello all, Is there way to pull a report for all generic accounts having General as Employee number along with Mailbox and OneDrive quota and last login details.
How to set time zone in microsoft teams - Hybrid Deployment
Hello, We are using teams in our organisation, and we're bringing on board some more people who are in different timezones. I've taken a look at this thread here:…
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…
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…
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…
Office add-in deployment within integrated apps: eligibility error with the Centralized Deployment
Hi, We have outlook add-in deployed via centralized deployment in "Microsoft 365 admin center > Settings. > IntegratedApps". For some time it was there and it worked. We went to update manifest file, this update didn't take any…
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,…
Orange.fr SMTP does not deliver to my Exchange 2013 server anymore
Hi all, We use an on premise Exchange 2013 Server for our mail base. Since a few weeks, only mails from @orange.fr can't contact our organization. Any othe domain can. I update SPF, DKIM and dmarc policy on our domain but nothing has changed. Every…
Configure outlook Error.
I have free licenses for my organization for learning and practice, on every user mail id is showing but when i go to configure in outlook or sending mail to that ID it's not completion please anyone can Help me out. Thanks Regards.

Gmail migration tool - stuck at NeedsApproval
Hello dear MS techs I'm pulling my hair off with having a problem with Gmail migration tool built-in Microsoft 365 admin center. I am using batch migration, not remote. I've done two pilot groups and there are many issues I'm facing with it and starting…
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…
Exchange stop warning with Warning ASP.NET 4.0.30319.0
Hi everybody, Exchange 2019 with last cu and su. i get multiple warning error : Log Name: Application Source: ASP.NET 4.0.30319.0 Date: 06/03/2025 18:51:23 Event ID: 1309 Task Category: Web Event Level: Warning Keywords:…
Exchange Server 2019 - ASP.NET 4.0.30319.0 Event ID 1309
Hello, I have an Exchange 2019 CU14 and it was working fine till I installed the Security Update for Exchange 2019 Cumulative Update 14 (KB5036401). since then my Event viewer is filled with ASP.NET 4.0.30319.0 Event ID 1309. ECP and OWA are working fine…