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I started getting this error on all Exchange 2013 servers when logging in OWA, ECP is fine.

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Internal error: version compat error VCE001
nourbenAsked:
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nourbenAuthor Commented:
It turned out that the error message came from a third party application called Messageware that we use to enhance OWA, Support sent us an update to be applied that fixed the issue.
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nourbenAuthor Commented:
OWAerror.JPG
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AmitIT ArchitectCommented:
Start with checking exchange related services. Make sure all services are running. Especially, which are set to automatic. Next open IIS and check, all sites are running. Check event logs for any error related to OWA. Finally, restart the server and check if that helps to fix it.
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nourbenAuthor Commented:
Messageware support helped me solving the problem
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