Determine which protocol to use - EWS, WebDav, or OWA?

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We're building a system to log in to a user's exchange account. The biggest issue we're facing is determining the method in which to connect to a user's account - be it Exchange Web Services, Outlook Web Access, or WebDAV. How can we determine which is turned on, and which isn't?

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Different protocols will provide different levels of access. Also different versions of Exchange Servers only support certain protocols. In order to be able to log into a broad range of email accounts you may end up having to support multiple protocols.

WebDAV is widely supported in Exchange 2000/2003. Support for it was reduced in Exchange 2007 and then dropped in Exchange 2010.

EWS is not supported in the earlier versions of Exchange but is well supported in Exchange 2007/2010 and Exchange365

IMAP is supported by all versions of Exchange but you would only have reduced functionality via this protocol