You can't open Microsoft Project Plan?
Since MS Project 2007 is getting more and more popular, there is a great chance that someone will send you a project plan that was created in MS Project 2007. And guess what? YOU HAVE 2003 version!!!. Damn... Don't worry, Microsoft (better late then never J) created a converter that allows you to convert MS Project 2007 file to 2003 version.
Of course, this comes with a price. You will have to download the 3rd service pack for Office 2003 which was released 10 days ago. After you installed it, you will be able to open project plan but as read-only. Yeah, I know, you would rather have the ability to change the project... But look at the bright side, better have it as read-only then as unknown file format J.
If you really have to edit the project plan, you will have to contact the person that sent you the project plan, and ask him to save it in 2000/2003 format. As always, additional prices to pay... After the plan is resaved in the new "old" format you will loose some data and/or formatting:
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Budget information will be lost
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Information in cross-project deliverables and dependencies fields will be lost
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Cost resources field will be converted into material resources
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Assignment owner information fields will be lost
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Calendar exceptions will be lost
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New fields and custom fields will be lost
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Enterprise custom fields will be lost