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Another Exchange 2003 to Exchange 2010 mail flow issue
During a migration recently, we came across another internal mail routing issue. The symptoms were identical to my previous post about Exchange internal mail routing. Mail was flowing from 2010 to 2003, from 2010 to the internet, but not from 2003 to 2010. I went through the normal check list looking at permissions, DNS, and the routing group connectors. I verified that both servers listed in the routing group connectors were the routing master in their respective routing groups through the 2003 ......

Posted On Wednesday, December 22, 2010 4:34 PM

Invalid attributes while converting mail-enabled groups
During a recent Exchange 2010 migration, we encountered issues with mail-enabled groups. At first we thought it was a SMTP related issue as no 2010 mailbox could send mail to any of the groups. The mail would just disappear. No NDR was delivered, it wasn’t in the queue, it simply vanished. Because of this issue, we decided to go ahead and convert all the groups to Universal Mail-Enabled groups through the Exchange 2010 EMC. This is when we encountered a really strange error. The groups would not ......

Posted On Wednesday, November 24, 2010 7:34 PM

Proxying OWA between CAS Arrays with Exchange 2007
Recently for a customer with a rather large exchange environment, we implemented multiple CAS Arrays across various sites in the network. The customer decided that all external access to OWA would come into once Internet entry point and that Array would proxy OWA request to the other CAS Arrays to retrieve the user mailbox. We found out quickly that this does not work straight off. When you create a new CAS array in PowerShell, it repopulates all the local URLs for the web services, autodiscover, ......

Posted On Wednesday, November 24, 2010 5:10 PM

Exchange 2010 OWA and Public Folders
I ran into a real head scratcher this week. While migrating a very public folder dependant organization, I couldn’t access public folders through OWA. I had full public folder functionality in the Outlook client, only OWA was affected. The environment was still in a hybrid state with production Exchange 2003 servers in the organization as well as DR servers which were using a third party replication package. The exact error I was getting looked like this: I had already established all 2010 and 2003 ......

Posted On Tuesday, October 19, 2010 7:40 PM

Windows 2008, Exchange, and TCP/IP Auto Tuning
Microsoft introduced TCP/IP Auto tuning with Vista and Windows 2008 server. Its also a part of Windows 7 and 2008 R2. This feature resizes IP packets which can improve network performance. Older network devices, however, like Cisco PIX firewalls do not support Auto tuning and can cause connection issues. I had a client that was getting email undeliverable errors from a certain domain while successfully sending to various others. After investigating OBL listings and various other possible culprits, ......

Posted On Friday, August 20, 2010 1:56 AM

Mailbox move issue from Exchange 2003 to Exchange 2010
Today while moving mailboxes between Exchange 2003 and Exchange 2010, I hit an issue with a couple of mailboxes. These mailboxes all popped access denied errors or more exactly: Insufficient Access Rights to perform the operation. The cause was similar to the mail flow issue in that inheritable permissions were not turned on for the user object in Active Directory. This also presented it’s own unique problem in that since the initial move request failed because of permissions, it had to be cleared ......

Posted On Wednesday, June 2, 2010 1:24 AM

Exchange Outlook Web Access Proxying across CAS Servers
In many larger environments, Exchange 2007 may be deployed with multiple Client Access Servers (CAS) across the AD site boundaries. The common configuration is to have users access one CAS server from the Internet and it proxy the request to a different CAS in the AD site where the user’s mailbox is located. The Internet facing CAS server should have the Internal URL populated with Forms Based Authentication (FBA) and Basic Authentication enabled. The External URL is optional. The authentication ......

Posted On Wednesday, November 25, 2009 11:21 AM

Redirection for Outlook Web Access with IIS 7 for Internal and External URLs
Http to Https redirection is commonly a preferred configuration for Outlook Web Access for most organizations. The challenges presented in IIS7 are that the built-in redirection feature only allows relative redirection without a full URL entered. To perform Http to Https, the full URL is required. This becomes an issue when organizations are trying to redirect for both internal and external users who commonly are using different URLs to access the server. The solution is 2 fold. First, turn on relative ......

Posted On Wednesday, November 25, 2009 8:16 AM

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