Moving Queue Database to a Different Exchange Server

Recently, a customer asked me if there was a way to bulk move all of a pending queue from one server to another. The only documentation I could find on this had you exporting the queue to .eml files and replaying them by dropping them in the pickup folder. That is fine and dandy, but…


Owaproxy component is in Inactive State and will not successfully activate

ISSUE: My customer put their Exchange 2016 environment into maintenance mode so they could apply bitlocker to their drives. After applying bitlocker following the guidances outlined in the following article, they were not able to set the ServerComponentState to Active for OWA Proxy: The customer runs the following command to see whether the state…


Unable to expand legacy onPrem Public Folders with O365 account

I have been seeing a few scenarios lately where users who log into Exchange using an account other than the OnPrem User Principal Name (UPN) are running into various difficulties. Today we will focus on one of those scenarios. We will discuss how we figured it out and what needs to be done to get the desired functionality….


Microsoft Filtering Management Service won’t start on Exchange 2013

Issue In a recent case, the transport service on an exchange 2013 server was failing to start due to a dependency failure (Error 1068: The dependency service or group failed to start). As it turned out, it was dependent on the Microsoft Filtering Management Service (FMS.exe), and that was the service that was having trouble…


How did that 1.5GB message get into my Exchange environment anyway?

ISSUE: Recently, I had a customer call in an issue where their transport services were failing on all Exchange 2013 servers usually within minutes of each other. Transport would restart on its own and then 15 minutes to an hour later, they would crash yet again. The following errors were showing up in the Event…


Mail not routing to on-premise Exchange 2013 environment from O365 with 450 4.7.320 Certificate validation failed error

Issue: User is trying to send email from his O365 Tenant in to the OnPrem Exchange 2013 environment. The email fails with the following reason (as seen in the message tracking logs in O365: Reason: [{LED=450 4.7.320 Certificate validation failed};{MSG=SubjectMismatch};{};{IP=###.###.###.###};{LRT=4/14/2017 1:07:17 PM}]. OutboundProxyTargetIP: ###.###.###.###. OutboundProxyTargetHostName: Cause: We found that the certificate it was trying…


What is KeepAliveTime used for in regards to Exchange?

This one setting has caused more debates and more confusion, and by proxy, more cases than perhaps any other thing in our Exchange Client Connectivity queues since I started working at Microsoft. There is a lot of confusion on what it is actually used for, so I am going to try and clear that up…


Only seeing first receive event when doing message tracking against a public folder that was migrated to O365 from Legacy Exchange

In Exchange 2010 and older (legacy exchange), when you migrate a public folder to O365, it makes a change that causes message tracking to only show the initial receive event when running message tracking against the legacy namespace. Scenario A Public Folder with a Primary SMTP email address of gets migrated to O365. You…


Mailbox migration times out when going from Exchange OnPrem to O365

ISSUE: When attempting to migrate an onPrem User mailbox from Exchange 2013 to O365, the following error is generated and the migration fails: The request channel timed out while waiting for a reply after 00:00:00.0012345. Increase the timeout value passed to the call to Request or increase the SendTimeout value on the Binding. The time…