For CDR that has been the case for at least 10 years. And then version 10 has already been outdated. In case your clients have Corel Draw X5 or higher, you can advise them to save/export an AI file. Works pretty well. But actually if I would deal with CDR files regularly I would have Corel Draw myself. Same goes for CAD. Conversion functions can only work, if the manufacturer of the other software documents their file format. When they don't, you have to hack into the file and figure it out yourself, which might or might not work. Most of the time it doesn't work too well.
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