No. I have seen clients with 100,000 calendar items. On a practical level though, you should try and keep below 3000 items in any one folder, otherwise the performance of Outlook will become very poor. Simon. Simon Butler, Exchange MVP Blog | Exchange Resources | In the UK? Hire Me.

Running Outlook 2010 (32bit) and Outlook 2007 in an Exchange 2003 environment. Hotmail not being used. Does Exchange 2003 impose any limits on the number of contacts or calendar entries for Outlook 2010 or Outlook 2007?

No. I have seen clients with 100,000 calendar items. On a practical level though, you should try and keep below 3000 items in any one folder, otherwise the performance of Outlook will become very poor. Simon. Simon Butler, Exchange MVP Blog | Exchange Resources | In the UK? Hire Me.