Backing Up Your Calendar
Backing up your outlook calendar is similar to Backing Up Your Email.
Instructions for Outlook 2007
Step 1: Start the Export
Once in Outlook 2007 click File then Import and Export....
Step 2: Select Export to File
Choose Export to File and click Next.
Step 3: Select Personal File
Select Export to Personal File and click Next.
Step 4: Choose Calendar
Now locate the Calendar folder under the Personal Folders heading.
Note: Make sure you check the Include Sub-folders option.
Step 5: Select the Location to Save
Now locate the Browse... button and navigate to the location where you would like to save the backup file. Then click the Finish button to finish backing up your calendar.