There will be some issues if you are using SSL encryption. Otherwise, it should work.
On the other hand, you can switch to newer clients than FMP 12 and your file should open and work OK.
Thanks very much. For right now, SSL is not an immediate consideration, but I appreciate the heads up. If we go with Server, we'll probably upgrade.
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I believe that :
v13.9 |<----- v15
To explain in more detail, they patched a vulnerability "mid-version" back when 13 was the most recent. This patch changes the protocol and so client versions using SSL encryption prior to that won't work with a server that uses the new protocol.
Note that you may want to find and change any layouts with "classic theme" to a different theme such as "minimalist" once you upgrade clients to 15.