Formula calculation differences between LO 5.3 and Excel

When I open most Excel documents I get a message (as per attached
screenshot) that says

"This document was last saved by Excel. Some formula cells may produce
different results when recalculated. Do you want to recalculate all
formula cells now?"

Where do I find out what these calculation difference might be?

Is there a document that outlines what incompatibilities exist between the
calculation engines?

If not, can someone summarize what potential issues I need to take into
account when using LO?

I am on digest mode so please cc me directly in any responses.

Thank you in advance for your help.

B.

This is not really an answer but you might search bugzilla to get an idea
of what types of differences exist and if any such differences are relevant
to your use. https://bugs.documentfoundation.org/