2,250 questions with Microsoft Exchange Hybrid Management tags
When changing from Distribution to Security, what is the impact or consequence?
What is the impact or consequences when changing the group type from Distribution to Security group? From: Into: Is the inbound email flow still working or stopped due to the AD group changes from On-premise AD DS? I cannot select the AD Distribution…

Exchange Hybrid Wizard. What settings should be used for cloud mailbox management only. No onboarding required.
My customer has an environment that has on-prem AD accounts syncing to M365 via Entra Connect. Mailboxes are in the cloud. The customer just wants to manage their cloud mailboxes from an on-prem Hybrid Exchange server. I have installed the Exchange…
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:…
Mitigations Cloud endpoint is not reachable Exchange 2019 Deployment
I receieve below warning during Exchange 2019 deployment Mitigations Cloud endpoint is not…
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…
HCW8001 Error: Unable to Determine the Tenant Routing Domain
Encountering the error HCW8001 Unable to determine the Tenant Routing Domain while running the Hybrid Configuration Wizard (HCW). Below are the relevant log entries observed during the process: 2025.03.05 15:09:31.633 10271 [Client=UX,…
How to get all users with alias as subdomain
Hello All, We need to pull a report where users having alias as our subdomains We have around 20k users and we need to filter out them with our subdomains (15). Please suggest a quick and easy to figure it out, pulling out the entire report and checking…
How to fix error Error: CommunicationErrorTransientException:Could not establish trust relationship for the SSL/TLS secure channel with authority
we are running a ybrid environment , we create user mailboxes on our on prem exchange and than migrate the mailbox to exchange online , we have been doing that succesfully up until last week , when it started fsiling for all mailboxes , it stay for the…
Application Impersonation
Hi All, I have received an email from Microsoft stating that the Application Impersonation RBAC role in Exchange Online will be retired in February. I want to identify which applications in my tenant are using this role. Will the script below fetch all…
Removing Exchange on-prem
Hi, We have inherited several sites where hybrid Exchange migrations were executed. Mailboxes have moved to M365 etc, but there is still an on-prem Exchange 2016 Server and ADSync is still in use. We want to get rid of these Exchange Servers as this…
On premise 2016 to exchange online
Hi all, i have a hosted exchange 2016 with 22 tenanats that I need to migrate. I don't want to install AAD connect or hybrid. Is there a way to do it manually by importing a CSV file? Or do a cutover with selective mailboxes?
Exchange Hybrid Wizard Error (413)
Hello, we are running into issues with the Hybrid Wizard. On the last point validation, we always getting the same error and dont know what to do, cuz it says the external server is responding with.... See Log attached. 2025.03.05 08:43:02.035 ERROR…
O365 Sync Issues After On-Premises Exchange Decommissioning
In a transition from a Hybrid environment to nearly full cloud usage, the on-premises Exchange was shut down due to security concerns, following documentation and recommendations while leaving the schema intact. Currently facing issues managing user…
SPF and DKIM is faling as emails are getting forwarded to one Cloud Anti-Phisihing Solution
Hello, We are using EOP as our email Gateway and once internet email reaches to EOP we are forwarding that internet email to one Cloud Anti-Phisihing Solution platform and then again email comes back to EOP but due to this routing when EOP check the SPF…
RemoteRouting issue on hybrid shared mailbox
We have some shared mailbox that someone has created in cloud only, this causes an issue with on-prem users that wish to be delegates of the m365 mailbox. The shared mailbox does not appear at all in EAC When attempting to Enable-RemoteMailbox…
How to change "Manage contact information" for a user?
getting this error every time i try to change the information for a users mailbox. Error executing request. The operation on mailbox "User" failed because it's out of the current user's write scope. The action 'Set-Mailbox',…
Re-install Exchange 2016 after system corruption
Hi All, Before we open a pay-per-incident(s) MS ticket, I thought I'd lob this scenario out to the community. Our sister organization has a lot of technical debt, both hardware and & software. We needed to get them on Exchange Online, and to do…
How is the default language/timezone is decided for Shared Mailboxes?
Hello, For User Mailboxes, the use is prompted when they sign in for the first time to OWA to decide their language and time zone. This decides the language they have for their Default folders (Inbox, Spam...) When they use Outlook Desktop, I assume…
Issue with Exchange 2019 on premise management shell after server 2025 "upgrade"
This is occurring on 2 sites that we are trying to migrate from on premise exchange and since the "auto" upgrade of server 2025 happened we are unable to access the management console The Exchange Admin Centre appears to be working fine and…
HCW0 - The method or operation is not implemented when running last step in Hybrid Configuration Wizard
We are running a full hybrid exchange environment and I'm getting this error when running the last step of the HCW. HCW0 - The method or operation is not implemented. 2024.07.26 21:30:59.298 10265 [Client=UX, Page=Ready, Thread=1] START via…