An evolution-ews bugfix update has been released for CentOS 7.

CentOS-announce: CEBA-2020:5038 CentOS 7 evolution-ews BugFix Update

CentOS Errata and Bugfix Advisory 2020:5038

Upstream details at :   https://access.redhat.com/errata/RHBA-2020:5038

The following updated files have been uploaded and are currently
syncing to the mirrors: ( sha256sum Filename )

x86_64:
1b57cc987d64b98efbaa6f796a3df838d4f4cc4a2b892e4e19685ea37ea8188d evolution-ews-3.28.5-8.el7_9.i686.rpm
369ac51f105f8b0b9fb343deb57c8ed97f3e08bbb535d683866ddfd47b058675 evolution-ews-3.28.5-8.el7_9.x86_64.rpm
a919c9e3a766f98e15edfc8dde8b699f46753980aaf8f4b46d2831fcc01cf9b7 evolution-ews-langpacks-3.28.5-8.el7_9.noarch.rpm

Source:
71c09c4b0f75187460c0f3761a395741e8b7659d1cbe92e51bad62558b4c7fd9 evolution-ews-3.28.5-8.el7_9.src.rpm