Hi Mark,
Export / Import is only designed to work with the same major Confluence versions so you would need to upgrade a 2.2.9 instance of Confluence to 3.5.17, export from that and then import that into the target 3.5.17 instance.
Having a quick scan through the upgrade notes for Confluence it looks like you should be able to go straight to 3.5.17 from 2.2.9 without any intermediate upgrades, but that is a big jump in versions so I would recommend checking the upgrade notes for the in-between versions documented under the relevant release notes for each version at https://confluence.atlassian.com/display/DOC/Release+Notes - I wouldn't be surprised if you needed to go to 3.0 or 3.3 from 2.2.9 before going to 3.5.17
Hope that helps?
Andrew.
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