Top Microsoft Exchange Solutions from Microsoft Supporthttp://support.microsoft.com/ph/13965The latest support information about Microsoft Exchange Solutions from Microsoft Product Support Services. Cluster database hangs, resulting in quorum loss in the failover clusterhttp://blogs.technet.com/b/exchange/archive/2011/11/20/recommended-windows-hotfix-for-database-availability-groups-running-windows-server-2008-r2.aspx#phrssDAG AdministrationIn early August of this year, the Windows SE team released the Knowledge Base (KB) article 2550886 and accompanying software hotfix regarding an issue in Windows Server 2008 R2 failover clusters. This blog post explains why this hotfix is strongly recommended for all databases availability groups that are stretched across multiple datacenters. Retry errors and Exchange Server 2007 Client Access server appears to hang when users try to synchronize Exchange ActiveSync deviceshttp://support.microsoft.com/kb/2656040#phrssMobility and ActiveSyncWhen users try to synchronize Exchange ActiveSync (EAS) devices with their mailboxes in Microsoft Exchange Server 2007 environments, they may encounter retryable errors. Additionally, the Microsoft Exchange Server 2007 Client Access server responds slowly or stops responding. Mail flow issues if Send Connectors are configured incorrectlyhttp://technet.microsoft.com/en-us/library/aa998662.aspx#phrssMail Flow IssuesAfter you install your first Hub Transport server, you must create additional connectors to begin sending and receiving messages from the Internet. Mail flow issues if Receive Connectors are configured incorrectlyhttp://technet.microsoft.com/en-us/library/aa996395.aspx#phrssMail Flow IssuesAfter you install your first Hub Transport server, you must create additional connectors to begin sending and receiving messages from the Internet. Exchange 2010 may fail with -1018 errors or suffer performance issues if File-level scanners are configured incorrectlyhttp://technet.microsoft.com/en-us/library/bb332342.aspx#phrssMail Flow IssuesIf you're deploying file-level scanners on Exchange 2010 servers, make sure that the appropriate exclusions, such as directory exclusions, process exclusions, and file name extension exclusions, are in place for both memory-resident and file-level scanning. Use the Mailbox Server Role Requirements Calculator to help you lay out your database copies correctlyhttp://blogs.technet.com/b/exchange/archive/2011/05/18/the-mailbox-server-role-requirements-calculator-now-with-database-copy-distribution.aspx#phrssSetup Deployment MigrationThis blog post discusses a new feature in the calculator that enables administrators to deploy the correct number of databases based on the number of copies and server architecture such that you can potentially achieve a symmetrical distribution after a failure event. Inbound or outbound e-mail messages are stuck in queues on Edge Transport Servershttp://technet.microsoft.com/en-us/library/bb851512(v=exchg.80).aspx#phrssMail Flow IssuesThis problem commonly occurs as a result of a mistake in configuration of the DNS settings of the Edge Transport server. This article can help you resolve this problem by correcting the DNS configuation. How to troubleshoot Client Access Servers (CAS) on Exchange Server 2010 SP1http://technet.microsoft.com/en-us/library/dd298096.aspx#phrssExchange 2010This content will help troubleshoot common errors and test to ensure that your Client Access server is configured correctly. This topic will be updated on a regular basis. Client connections dropping in Outlook or other MAPI applications with Event ID: 25 and Event ID: 26http://support.microsoft.com/kb/2535656#phrssOutlook general connectivityThis article provides solutions to an issue in which a configuration for a hardware load balancer, or other network device such as a firewall or proxy, is causing client connections to drop. Mailbox Store cannot mount due to running out of disk space on the transaction log drivehttp://blogs.technet.com/b/exchange/archive/2011/11/09/capacity-planning-yes-transaction-log-space-is-critical-to-keeping-your-databases-healthy-and-mounted.aspx#phrssPerformanceTransaction log space is critical to keeping your databases healthy and mounted. This article can help properly size a transaction log LUN. Log files replicate in unexpected ways in an Exchange 2010 Database Availability Grouphttp://blogs.technet.com/b/timmcmic/archive/2011/09/26/exchange-2010-collapsing-dag-networks.aspx#phrssDAG AdministrationAs a post configuration step in an Exchange 2010 Database Availability Group installation the administrator may need to collapse Database Availability Group Networks to ensure that the replication service functions in an optimized fashion. How to design a Highly Available Database Copy Layouthttp://blogs.technet.com/b/exchange/archive/2010/09/10/3410995.aspx#phrssDAG AdministrationExchange 2010 introduced the database availability group (DAG), which enables you to design a mailbox resiliency configuration that is essentially a redundant array of independent Mailbox servers. This article discusses design principles that should be used when planning the database copy layout. Cannot download the Offline Address Book (OAB) from a server that is running Microsoft Exchange Server 2010http://support.microsoft.com/kb/2290340#phrssOAB Download failsThis Microsoft Knowledge Base article explains how to resolve this issue which can occur if an HTTPS redirection is configured incorrectly in Internet Information Services (IIS) 7. If HTTPS redirection is configured incorrectly, Web.config files that are not required may be created. Exchange Server Deployment Assistant Update for Exchange 2007 and Office 365 Coexistencehttp://blogs.technet.com/b/exchange/archive/2011/04/26/exchange-server-deployment-assistant-update-for-exchange-2007-and-office-365-coexistence.aspx#phrssExchange 2010 Create Additional Routing Group Connectors from Exchange 2010 to Exchange 2003http://technet.microsoft.com/en-us/library/aa997292.aspx#phrssMail Flow IssuesThis article explains how to use the Exchange Management Shell to configure routing group connectors between the default routing group in Microsoft Exchange Server 2010 and Exchange Server 2003 routing groups. Understanding Back Pressurehttp://technet.microsoft.com/en-us/library/bb201658.aspx#phrssMail Flow IssuesBack pressure is a system resource monitoring feature of the Microsoft Exchange Transport service that exists on Microsoft Exchange Server 2010 Hub Transport and Edge Transport servers. Exchange transport can detect when vital resources, such as available hard disk space and memory, are under pressure, and take action in an attempt to prevent service unavailability. Understanding DNS query failure sensitivityhttp://technet.microsoft.com/en-us/library/bb676467.aspx#phrssMail Flow IssuesYou can adjust the DNS query sensitivity for slightly faster message delivery when DNS errors are encountered for the destination domain. However, depending on the DNS errors, this adjustment may cause delivery failures in certain circumstances. Understanding Database Availability Groupshttp://technet.microsoft.com/en-us/library/dd979799.aspx#phrssDAG AdministrationThis article is an excellent starting point for understanding database availability groups. The DAG is the base component of the high availability and site resilience framework built into Microsoft Exchange Server 2010. Implementing a dedicated backup network http://blogs.technet.com/b/timmcmic/archive/2011/10/25/exchange-2010-implementing-a-dedicated-backup-network-for-a-database-availability-group.aspx#phrssDAG AdministrationOccasionally, customers that deploy highly available Mailbox servers use a dedicated or secondary network for backup operations. The way in which you do this in Exchange 2010 has changes, and it’s important that when you implement such a configuration that you don’t use the methods or instructions designed for previous versions of Exchange. Exchange Management Shell Basicshttp://technet.microsoft.com/en-us/library/dd351152.aspx#phrssAdministration (UI/Shell)This article is a complete guide to the Exchange Management Shell and how to use it. Exchange Management Consolehttp://technet.microsoft.com/en-us/library/bb123762.aspx#phrssAdministration (UI/Shell)This article is a complete guide to the Exchange Management Console and how to use it. Troubleshooting Exchange 2010 Management Tools startup issueshttp://blogs.technet.com/b/exchange/archive/2010/02/04/3409289.aspx#phrssAdministration (UI/Shell)This blog post discusses some of the most common errors that may be seen when attempting to open the Exchange Management tools (Exchange Management Console and Exchange Management Shell). A fix for the interoperability issues between Exchange 2007 and 2010 EMC and IE9 is now availablehttp://blogs.technet.com/b/exchange/archive/2011/10/17/a-fix-for-the-interoperability-issues-between-exchange-2007-and-2010-emc-and-ie9-is-now-available.aspx#phrssAdministration (UI/Shell)This blog post discusses a recent fix for an issue in which Exchange 2007 or 2010 EMC might fail to close with "You must close all dialog boxes before you can close Exchange Management Console." Reset Client Access Virtual Directorieshttp://technet.microsoft.com/en-us/ff629372.aspx#phrssOAB Download failsThis article explains how to Use the Reset Client Access Virtual Directory wizard to reset a virtual directory on an Exchange Server 2010 Client Access server. When you reset a virtual directory, the virtual directory is removed and a new virtual directory with default settings is created. Remove, Re-Create, and Reconnect an Offline Address Book Virtual Directoryhttp://technet.microsoft.com/en-us/bb123595(v=EXCH.80).aspx#phrssOAB Download failsThis article explains how you can You can use the Shell to remove, re-create, and then reconnect an offline address book (OAB) virtual directory. How to redirect requests from HTTP to HTTPS or to the OWA virtual directory in IIS 7http://support.microsoft.com/kb/975341#phrssOWA ConnectivityThis article explains how you can use the built-in automatic HTTP Redirect feature in Internet Information Services (IIS) 7 that lets you redirect users to any URL or virtual directory without requiring you to write custom scripts. Current issues with Microsoft Exchange ActiveSync and Third Party Deviceshttp://support.microsoft.com/kb/2563324#phrssActiveSyncThis article lists current issues observed by Microsoft Support for Exchange Server 2007 and Exchange Server 2010 ActiveSync with third-party devices. Exchange 2007 or 2010 EMC might fail to close with "You must close all dialog boxes before you can close Exchange Management Console"http://blogs.technet.com/b/exchange/archive/2011/10/17/a-fix-for-the-interoperability-issues-between-exchange-2007-and-2010-emc-and-ie9-is-now-available.aspx#phrssCompatibilityA fix for the Exchange Management Console (EMC) issues when Internet Explorer 9 is installed is now available. You do not need to call Microsoft Support to get the fix to resolve this issue. All that is required now is installation of December 13, 2011 IE security update, KB 2618444. This blog post has been updated accordingly. OWA Cross-Site Silent Redirection in Exchange 2010 SP2http://blogs.technet.com/b/exchange/archive/2011/12/12/owa-cross-site-silent-redirection-in-exchange-2010-sp2.aspx#phrssCross-site redirectionAs its name implies, Cross-Site Silent Redirection only performs silent redirection for requests that are destined to CAS located in another Active Directory site (within the same Exchange organization) that have an OWA ExternalURL. How to allow double booking of a resource roomhttp://blogs.technet.com/b/exchange/archive/2012/01/23/recurring-meeting-requests-with-conflicting-instances-2-the-power-of-delegates.aspx#phrssResource Booking AssistantThe Resource Booking Assistant never allows double booking of a resource room calendar as a result of a recurring meeting request. As there may be times when an administrator may want to allow double-booking, we offer some workarounds. Time to revisit recommendations around Windows networking enhancements usually called Microsoft Scalable Networking Packhttp://blogs.technet.com/b/exchange/archive/2011/11/14/time-to-revisit-recommendations-around-windows-networking-enhancements-usually-called-microsoft-scalable-networking-pack.aspx#phrssNetworkThis blog post discusses improvements in the Microsoft Scalable Networking Pack (individual features are known as Receive Side Scaling (RSS) and Chimney/TCP Connection Offload/TOE), and the effect of having them enabled or disabled on our servers. What is supported inExchange 2010 Service Pack 2 hosting scenarioshttp://blogs.technet.com/b/exchange/archive/2011/12/06/exchange-2010-service-pack-2-and-hosting.aspx#phrssHostingThis blog post clarifies what is supported in what are typically referred to as hosting scenarios. Robert’s Rules of Exchange: Multi-Role Servershttp://blogs.technet.com/b/exchange/archive/2011/04/08/robert-s-rules-of-exchange-multi-role-servers.aspx#phrssExchange 2010 Jetstress Field Guide – April 2011 Releasehttp://blogs.technet.com/b/exchange/archive/2011/04/29/jetstress-field-guide-april-2011-release.aspx#phrssExchange 2010 How to manage groups with groups in Exchange 2010http://blogs.technet.com/b/exchange/archive/2011/05/04/how-to-manage-groups-with-groups-in-exchange-2010.aspx#phrssExchange 2010 Announcing Enhanced Hardware Virtualization Support for Exchange 2010http://blogs.technet.com/b/exchange/archive/2011/05/16/announcing-enhanced-hardware-virtualization-support-for-exchange-2010.aspx#phrssExchange 2010 Exchange 2010 High Availability Misconceptions Addressedhttp://blogs.technet.com/b/exchange/archive/2011/05/31/exchange-2010-high-availability-misconceptions-addressed.aspx#phrssExchange 2010 IPhone AcvtiveSync Issues after installing Exchange 2010 SP1http://social.technet.microsoft.com/Forums/en/exchangesvrmobility/thread/321eae51-9cbd-4a5e-85c1-68d8f7b523c3#phrssExchange 2010This blog post explains how to resolve a variety of IPhone ActiveSync issues that occur after you install Exchange 2010 SP1. In Outlook 2003, e-mail messages take a long time to send and receive when you use an Exchange 2010 mailboxhttp://support.microsoft.com/kb/2009942#phrssExchange 2010This content explains how to resolve a variety of outgoing email issues that occur when you use Outlook 2003 with an Exchange 2010 mailbox.