Understanding Migration Concurrency

A common source of confusion for customers using MRS and Migration Service to perform migrations into Exchange Online is migration concurrency.  The most basic definition of migration concurrency is the number of moves that are allowed to run at the same time against a particular migration endpoint. It makes sense that all on-premises environments are…

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It’s always the Load Balancer

Ok, this is probably an (intentionally) inflammatory title, but in this case, it’s absolutely true. A common Exchange Online migration issue we see is the SourceMailboxAlreadyBeingMovedTransientException which I previously blogged about.  One of the most common reasons we see for this error is a communications error (found using the command in the previous blog) that looks…

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Source mailbox already being moved errors while moving mailboxes

It’s been a long time since I wrote a blog post, but this one comes up a lot so I figured I’d do a write-up on it. When moving mailboxes using to Exchange 2010, Exchange 2013, Exchange 2016, or Exchange Online (Office 365), a common error you can hit is SourceMailboxAlreadyBeingMovedTransientException.  What this appears to…

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Internet Explorer 8 impacts OWA Load Balancing Scenarios

Recently we’ve had several issues reported regarding Internet Explorer 8 and Outlook Web Access load balancing scenarios. Here are the scenarios we’ve identified so far: DNS Round robin load balancing when DNS TTL expires DNS Round robin load balancing when outbound HTTP Proxy servers are used SSL Session-ID persistence with a hardware load balancer The…

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Autodiscover and Client-only Sites (Revisited)

Previously I had posted a problem regarding Autodiscover site-scoping and client-only sites.  For sites that do not have Exchange Servers in them, the corresponding client sites must be added to the SCP object so that Outlook clients will discover the closest Client Access Servers for Autodiscover. I want to call out one issue I was…

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How NOT to Deploy Client Access Servers

I have obviously been really busy since December since that is the last time I posted a blog entry.  It’s rather embarrassing, but I’ve been devoting a lot of my time to an Exchange Troubleshooting tool hopefully to be unveiled in the Exchange 14 timeframe – more to come later on this. In these 5…

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Autodiscover HTTP Redirect Method using ISA instead of a second web site

Many customers that are hosting multiple SMTP domains need to use one of our Autodiscover “redirect” methods to deploy autodiscover instead of the pre-defined URL approach.  When customers choose a “redirect” method they have two options.  Below is a chart with both options and some Pro’s and Con’s of each. Method Pros Cons HTTP Redirect…

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Handy way to restart downed Exchange Services (and only the ones you need)

Here’s a quick Powershell one-liner to start up all the necessary Exchange Services for any given role. Test-ServiceHealth | Select-Object -Expand ServicesNotRunning | Start-Service There is also the old standby:Get-Service *Exchange* | Start-Service But that one can start unnecessary services (set to manual) like the Exchange Pop3 and Imap4 service. Just thought it’d make and…

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CAS Load-Balancing Best Practices (Part 2)

CAS Load Balancing Best Practices (Part 2: Load balancing Intranet aka "Non-Internet facing" sites): For Part 1 of this post, go here: CAS Load-Balancing Best Practices (Part 1) You need to understand CAS->CAS Proxying before you try to understand load-balancing proxy CAS’s.  Please read the following technet documentation if you don’t understand CAS->CAS Proxy before…

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New Updates to Autodiscover Whitepaper available

Just wanted to let folks know that a new update to the Autodiscover Whitepaper is now available.  This now contains tons more information regarding certificates, web service URL’s, best practices, etc.  You can find the whitepaper here:http://technet.microsoft.com/en-us/library/bb332063.aspx You can find the Exchange team blog announcment here:http://msexchangeteam.com/archive/2007/10/03/447176.aspx The only thing it doesn’t really cover right now is load-balancing,…

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