Hi, all! Client workstations are Win7/Pro with Office 2010; back-end is Exchange 2003 on Server 2k3 R2. On every machine that we roll out, Outlook 2010 is running extremely slow for the first few days, almost to the point of being unusable. The first time I launch it (for example) I just walk away for 2 hours, because on any mouse click it freezes ("not responding"). Opening emails can take several minutes, and in general navigating causes Outlook to freeze for several minutes. Eventually (a few days later) the serious lags go away, but in general the performance of Outlook 2010 is extremely poor (to the point that I'm about to suggest uninstalling Outlook 2010 and installing Outlook 2007). Windows Search plug-in is not enabled; no large PST files are being opened. Is there something on the back end we should configure differently for Outlook 2010? Are there any specific configuration things we should be looking at on Exchange? Deleting and re-creating the client-side profile had no effect. Any suggestions? Thanks!

Have you tried both cached mode and online mode for Outlook? Windows Search is built into Windows 7 so Outlook will index all your E-mails when you run the program. /MartinExchange is a passion not just a collaboration software.

mracket, thanks for replying! Yes, both cached and non-cached have been tried. By default we have caching shut off. And the plug-in for Windows Search within Outlook has been disabled.

What processes is taking all the CPU? I assume that the freezes is because the CPU is maxing out. /MartinExchange is a passion not just a collaboration software.

Hi, As Outlook can work well with a variety of e-mail servers For this issue, and only cannot connect to a computer that is running Microsoft Exchange 2000 Server or earlier version of Exchange, so this may not the problem for Outlook 2010 work with Exchange Server 2003. For this issue, I want you follow these steps to troubleshoot the problem: 1. please follow Mracket’s suggestion and disable all third party antivirus to have a try. 2. please use Best Practices Analyzer tool to do a health check for the Exchange Server. (If there is any error, please follow the suggestions to resolve the problems.) 3. If your Outlook and Exchange Server have not installed latest updates, please installed latest updates to have a try. Here is a related articles for you: Assess how Outlook 2010 works with different versions of Exchange Server http://technet.microsoft.com/en-us/library/cc178996.aspx If the problem is still exists, please feel free to let me know and I will be glad to help. Thanks, Evan

Hi, As Outlook can work well with a variety of e-mail servers For this issue, and only cannot connect to a computer that is running Microsoft Exchange 2000 Server or earlier version of Exchange, so this may not the problem for Outlook 2010 work with Exchange Server 2003. For this issue, I want you follow these steps to troubleshoot the problem: 1. please follow Mracket’s suggestion and disable all third party antivirus to have a try. 2. please use Best Practices Analyzer tool to do a health check for the Exchange Server. (If there is any error, please follow the suggestions to resolve the problems.) 3. If your Outlook and Exchange Server have not installed latest updates, please installed latest updates to have a try. Here is a related articles for you: Assess how Outlook 2010 works with different versions of Exchange Server http://technet.microsoft.com/en-us/library/cc178996.aspx If the problem still exists, please feel free to let me know and I will be glad to help. Thanks, Evan