View Outlook 2003 User Calendars in Exchange 2010

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Here’s the background of the issue I am encountering. I am upgrading from Exchange 2003 server to Exchange 2010 server. The Exchange 2003 has SP2 Enterprise with 1 front end and 3 back-up end server and all functioning on Windows 2003 Standard SP2.One of our users in Outlook 2003 is scheduling an appointment with someone using Exchange 2010. He wants to view Exchange 2010 user’s calendar to check availability but he was unable to view it. All he sees are lines. He tried using OWA with the same results. However, users on Exchange 2010 can see each other’s calendars and they can also view the calendars of Exchange 2003 users. Can you help me enable the Outlook 2003 user to view user calendars using Exchange 2010? Thanks.

Answered By 15 points N/A #96834

View Outlook 2003 User Calendars in Exchange 2010


When viewing outlook calendars in exchange 2010, some problems might arise as indicated below:

  1. Although mailbox will be  on Exchange 2010, outlook 2003 will use Exchange 2010’s Address Book service so as to query the legacyDN of target shared mailboxes/calendars which need to be opened,  Exchange 2010 will  return this as mungedDNs, and this action will force the  outlook 2003 to think it’s a new server each time, and then make to establish more connections so that the default allowed maximum of 20 connections will be eventually exhausted.
  2. The Outlook 2003 will keep hidden persistence messages which have the information about the shared mailboxes/calendars, which may include things such as user name,  server. And for that case it will not be having an updated information and therefore it could very well reach a non-existing server.

The solution to the above problems will be as follows:

  1. For the first problem, what you will need to do is set up a custom throttling policy with RCAMaxConcurrency which will be set at 100, and then you will need to apply that policy on mailboxes that are  still using Outlook 2003. 
  2. But the for the second problem, you will either need to remove the stale entries and then re-add the shared calendar entries; you can just choose to run ‘outlook.exe /resetnavpane’ switch.

-Clair Charles


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