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  • Blog Post: MAPI Messaging Benchmark Being Retired

    MAPI Messaging Benchmark ( MMB3 /MMB4) has been the benchmark for measuring the performance and scalability of computers running Microsoft Exchange Server.  While MMB has served its purpose, it also has limitations in helping our customers compare solutions.  Among the most significant limitations...
  • Blog Post: What happened to Badmails in Exchange 2003 SP1?

    What are badmails? Badmails are mail that the Exchange server cannot deliver or NDR (non-delivery report). A common source of badmails comes from the unsuccessful attempt to deliver an DSN (delivery status notifiction. NDR is a form of DSN). We keep badmails around primarily for diagnostics. Badmails...
  • Blog Post: How Transport Selects Certificates for TLS

    Understanding how certificates are selected for a Transport layer Security (TLS) session will help you troubleshoot TLS issues. Since we shipped Exchange 2007, support engineers Jenny Frye and Stuart Presley have been helping customers work through issues around deploying Domain Security and using TLS...
  • Blog Post: Part 3: Reverse Proxy for Exchange Server 2013 using IIS ARR

    In the two previous posts in this series (see Part I and Part II ), we saw the two different options by which we could effectively use IIS Application Request Routing (ARR) as a reverse proxy solution for Exchange 2013. However wouldn’t it be great to know if your implementation of IIS ARR was...
  • Blog Post: Introducing: Log Parser Studio

    Download Anyone who regularly uses Log Parser 2.2 knows just how useful and powerful it can be for obtaining valuable information from IIS (Internet Information Server) and other logs. In addition, adding the power of SQL allows explicit searching of gigabytes of logs returning only the data that is...
  • Blog Post: Understanding login strings with POP3/IMAP

    Of the various processes for logging into a POP3/IMAP4 service of the Exchange server, the most commonly used is Basic Authentication through an SSL encrypted session. When choosing this method, each client is asked to provide a username and password. While this process may seem relatively strait forward...
  • Blog Post: Why all Exchange ActiveSync experiences aren’t the same… and how to know what you’re getting

    One of the most frequent questions I get as the Product Manager for Exchange ActiveSync (EAS) is for a list of EAS -enabled devices customers can use for mobile email and what functionality they support. This is often a difficult thing to provide since Microsoft licenses patents (which are Microsoft’s...
  • Blog Post: SMTP Session Tarpitting for Windows 2003 and Exchange

    A common strategy for increasing the cost of would-be mail abuse uses a technique called tarpitting. Mail servers that tarpit wait a specified period of time before issuing SMTP responses to the client, thus increasing the time investment needed to successfully send a large amount of mail or a constant...
  • Blog Post: Combining Web Farm publishing with Software or Hardware Based Load Balanced CAS arrays

    In my post just the other day I provided a link to the new guide covering Exchange publishing via Forefront TMG or UAG. One poster followed up by asking, “How do I set things up when I have both TMG/UAG with a web farm and a hardware load balancer?” It’s a great question, as these days hardware load...
  • Blog Post: Snap, crackle... IMAP! er... SMTP? er... HTTP! Aw, heck...

    Working within protocols for several years, one of the most invaluable tools that we have in our toolbox is the Network Monitor (one of the tools in the Microsoft Systems Management Server, Microsoft Windows 2000 Server, or Microsoft Windows Server 2003, and has a nice little FAQ here: Frequently Asked...
  • Blog Post: Life in a Post TMG World – Is It As Scary As You Think?

    Let’s start this post about Exchange with a common question: Now that Microsoft has stopped selling TMG, should I rip it out and find something else to publish Exchange with? I have occasionally tried to answer this question with an analogy. Let’s try it. My car (let’s call it Threat Management Gateway...
  • Blog Post: Entourage 2004 SP2

    The Entourage team has blogged recently about the release of Entourage 2004 SP2: What's new in Entourage 2004 SP2 SP2 details: Enforcing Exchange Permissions within Entourage Entourage 2004 SP2: Common GAL issues - KC Lemson
  • Blog Post: The "Inside Microsoft Exchange 2007 Web Services" book has arrived!

    The Exchange Web Services team is proud to announce that MS Press has released the first book describing the new unifying API in Exchange 2007. Authored exclusively by members of the Exchange Team, this book is a hefty 928 pages filled with in-depth coverage of messaging, folders, calendaring, contacts...
  • Blog Post: And you thought you knew what "MAPI" stands for...

    Andy Brauninger, a PM on the Outlook team, took the following photo downtown Seattle few weeks ago. We thought this was just too cool not to post!! For those of you that do feel like email ninjas, there is always http://www.exchangeninjas.com/ ! - The Exchange Team
  • Blog Post: Part 2: Reverse Proxy for Exchange Server 2013 using IIS ARR

    In my previous article we saw that how easy it was to implement IIS ARR as a Reverse Proxy and Load Balancing solution for Exchange 2013. However that option is not the best if you are looking to achieve true high availability for your client connectivity. Read on and it’ll Arrrr! become clear...
  • Blog Post: Announcing the release of Exchange Server Remote Connectivity Analyzer

    Have you ever installed an Exchange server and wanted to verify your Internet facing services were setup and configured properly? Things like Exchange ActiveSync, AutoDiscover, Outlook Anywhere (RPC/HTTP), and inbound email. Sure there are cmdlets included in Exchange 2007 like test-ActivesyncConnectivity...
  • Blog Post: Implementing TLS between two Exchange Server organizations

    We have had some requests to talk more about the process to implement TLS between two Exchange organizations. Here it is! The following walk-through should help you do this. Note that those instructions apply to Exchange Server 2000/2003. We will follow up with Exchange Server 2007 functionality at the...
  • Blog Post: IMAP4 and Exchange 2010 RTM

    I'd like to take the time to highlight the significant improvements in the performance of the Internet Message Access Protocol 4 (IMAP4) in Exchange 2010, and also emphasize the importance of knowing the mailbox size when sizing your Client Access Servers for IMAP4 users. These results, and more details...
  • Blog Post: Ask The Exchange Perf Guy: How do large item counts & IMAP clients affect CAS CPU in Exchange 2007?

    We recently updated our maximum item count guidance for Exchange 2007 when IMAP clients are being used. As a result, I've gotten a number of questions about the reasons for the change. Hopefully this post will help to answer those questions. In Exchange 2007, the product went through some major architectural...