That you put this in "iPhone 4" makes me wonder if you have software that's terribly out of date or no longer supported.
Current Outlook is Office 365, the code base is the same between Mac & Windows, and with proper setup all of your important data should be on any of your cloud, desktop or mobile instances.
If you have an old setup there are export options. If your software is an old unsupported version upgrade and get your setup done right because that means you have no migration to do. That means you have your important info everywhere in addition to much improve products.