XCOM Data Transport Compatibility with other XCOM releases. Is there a matrix indicating compatible levels of XCOM across all the platforms? Is there a lifecycle chart?
All supported versions of XCOM are compatible with all other supported versions of XCOM.
Here is a link to the End of Service (EOS), End of Life (EOL), Stabilization Dates, other dates are available by viewing this chart:
XCOM Product Lifecycle Details
Please scroll down the page until you encounter the Product Lifecycle Details section. Use the "Search by Description", for example "Windows", to narrow down the list of platforms and versions.
All versions and service packs of all products on this list that are NOT EOS (end of service) or EOL (end of life) are compatible.
NOTE: When it comes to features like SSL or UNICODE you need to run Versions of XCOM on both sides which support these - otherwise you cannot use the feature.