The Migration Wizard does not migrate all the calendar items in Exchange Server 2003 Service Pack 1

After your mailboxes are migrated from Microsoft Exchange 5.5 to Microsoft Exchange 2003 Service Pack 1 by using the Exchange Migration Wizard, you may notice that not all the calendar items in Exchange Server Service Pack 1 are migrated. Instead, only some of your calendar items are migrated.

A change was made in Microsoft Exchange 2003 Service Pack 1 to avoid duplicating calendar items during migration from an Exchange 5.5 calendar to an Exchange 2003 calendar.

When you paste a calendar item from an Exchange 5.5 calendar to an Exchange 2003 calendar, the new calendar item shares the unique identifier with the old calendar item. Therefore, the two calendar items are considered duplicate items. Only the calendar item that was modified last is migrated.

Service pack information

To resolve this problem, obtain the latest service pack for Exchange Server 2003. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language. The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. This problem was first corrected in Exchange Server 2003 Service Pack 2.

For additional information, click the following article number to view the article in the Microsoft Knowledge Base: For additional information, click the following article number to view the article in the Microsoft Knowledge Base: For additional information, click the following article number to view the article in the Microsoft Knowledge Base: