diff --git a/0001-I-250-Mail-Calendar-attachments-can-be-broken-by-the.patch b/0001-I-250-Mail-Calendar-attachments-can-be-broken-by-the.patch
new file mode 100644
index 0000000..de9d2b1
--- /dev/null
+++ b/0001-I-250-Mail-Calendar-attachments-can-be-broken-by-the.patch
@@ -0,0 +1,71 @@
+From 19678170eb8a36c67dabf4c7eb234a69f032d94b Mon Sep 17 00:00:00 2001
+Date: Wed, 13 Dec 2023 12:16:45 +0100
+Subject: [PATCH] I#250 - Mail: Calendar attachments can be broken by the
+ server
+
+Closes https://gitlab.gnome.org/GNOME/evolution-ews/-/issues/250
+---
+ src/EWS/camel/camel-ews-folder.c | 33 ++++++++++++++++++++++++++++++--
+ 1 file changed, 31 insertions(+), 2 deletions(-)
+
+diff --git a/src/EWS/camel/camel-ews-folder.c b/src/EWS/camel/camel-ews-folder.c
+index 84fdcf11..b1203489 100644
+--- a/src/EWS/camel/camel-ews-folder.c
++++ b/src/EWS/camel/camel-ews-folder.c
+@@ -344,7 +344,7 @@ ews_get_calendar_mime_part (CamelMimePart *mimepart)
+ }
+ 
+ static gchar *
+-ews_update_mgtrequest_mime_calendar_itemid (const gchar *mime_fname,
++ews_update_mtgrequest_mime_calendar_itemid (const gchar *mime_fname,
+                                             const EwsId *calendar_item_id,
+                                             gboolean is_calendar_UID,
+ 					    const EwsId *mail_item_id,
+@@ -404,6 +404,35 @@ ews_update_mgtrequest_mime_calendar_itemid (const gchar *mime_fname,
+ 		if (ba && ba->len) {
+ 			g_byte_array_append (ba, (guint8 *) "\0", 1);
+ 			icomp = i_cal_parser_parse_string ((gchar *) ba->data);
++			if (!icomp) {
++				const gchar *content = (const gchar *) ba->data;
++				const gchar *begin_vcalendar, *end_vcalendar;
++
++				/* Workaround Office365.com error, which returns invalid iCalendar object (without 'END:VCALENDAR'),
++				   in the MimeContent's text/calendar attachments as of 2023-12-12. */
++				begin_vcalendar = camel_strstrcase (content, "BEGIN:VCALENDAR");
++				end_vcalendar = camel_strstrcase (content, "END:VCALENDAR");
++
++				/* If it exists, then it should be alone on a separate line */
++				if (!(begin_vcalendar && (begin_vcalendar == content || begin_vcalendar[-1] == '\n') &&
++				    (begin_vcalendar[15 /* strlen ("BEGIN:VCALENDAR") */] == '\r' || begin_vcalendar[15] == '\n')))
++					begin_vcalendar = NULL;
++
++				/* If it exists, then it should be alone on a separate line and not at the very beginning of the mime_content */
++				if (!(end_vcalendar && end_vcalendar > content && end_vcalendar[-1] == '\n' &&
++				    (end_vcalendar[13 /* strlen ("END:VCALENDAR") */] == '\r' || end_vcalendar[13] == '\n' || end_vcalendar[13] == '\0')))
++					end_vcalendar = NULL;
++
++				if (begin_vcalendar && !end_vcalendar) {
++					g_byte_array_remove_index (ba, ba->len - 1);
++					#define add_str(_str) g_byte_array_append (ba, (guint8 *) _str, strlen (_str))
++					add_str ("\r\nEND:VCALENDAR\r\n");
++					#undef add_str
++					g_byte_array_append (ba, (guint8 *) "\0", 1);
++
++					icomp = i_cal_parser_parse_string ((const gchar *) ba->data);
++				}
++			}
+ 		}
+ 		if (icomp) {
+ 			ICalComponent *subcomp;
+@@ -922,7 +951,7 @@ camel_ews_folder_get_message (CamelFolder *folder,
+ 		e_ews_additional_props_free (add_props);
+ 		g_slist_free (html_body_ids);
+ 
+-		mime_fname_new = ews_update_mgtrequest_mime_calendar_itemid (mime_content, calendar_item_accept_id, is_calendar_UID, e_ews_item_get_id (items->data), html_body, error);
++		mime_fname_new = ews_update_mtgrequest_mime_calendar_itemid (mime_content, calendar_item_accept_id, is_calendar_UID, e_ews_item_get_id (items->data), html_body, error);
+ 		if (mime_fname_new)
+ 			mime_content = (const gchar *) mime_fname_new;
+ 
+-- 
+2.41.0
+
diff --git a/evolution-ews.spec b/evolution-ews.spec
index 60e727d..f98a1ee 100644
--- a/evolution-ews.spec
+++ b/evolution-ews.spec
@@ -6,12 +6,14 @@
 
 Name: evolution-ews
 Version: 3.40.4
-Release: 1%{?dist}
+Release: 2%{?dist}
 Summary: Evolution extension for Exchange Web Services
 License: LGPLv2+
 URL: https://wiki.gnome.org/Apps/Evolution
 Source: http://download.gnome.org/sources/%{name}/3.40/%{name}-%{version}.tar.xz
 
+Patch01: 0001-I-250-Mail-Calendar-attachments-can-be-broken-by-the.patch
+
 %global eds_evo_version %{version}
 
 Requires: evolution >= %{eds_evo_version}
@@ -92,6 +94,9 @@ export CFLAGS="$RPM_OPT_FLAGS -Wno-deprecated-declarations"
 %files langpacks -f %{name}.lang
 
 %changelog
+* Wed Dec 13 2023 Milan Crha <mcrha@redhat.com> - 3.40.4-2
+- Resolves: RHEL-19371 (Backport upstream patch to workaround broken text/calendar mail attachments by the server)
+
 * Fri Aug 13 2021 Milan Crha <mcrha@redhat.com> - 3.40.4-1
 - Related: #1992450 (Update to 3.40.4)