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Apple notes that "immediately after updating to iOS 4, some users may notice that Exchange ActiveSync Mail, Contacts, or Calendars do not sync, or sync very slowly. In addition, some Exchange Server administrators may notice their servers running slowly."
The issue, according to a report by the site , is that iOS 4 sets a low 30 second default timeout for server requests that can overwhelm the server.
Apple has published a mobile configuration update file that administrators can distribute to iPhones and iPod touch users running iOS 4. The configuration update can also be downloaded directly to the device from Mobile Safari, using a link Apple provides.
Once installed and the device is restarted, the configuration update sets the timeout to 240 seconds, a change that has proven to fix sync issues for most users.