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Diffstat (limited to 'program/lib/Roundcube/rcube_washtml.php')
-rw-r--r--program/lib/Roundcube/rcube_washtml.php3
1 files changed, 2 insertions, 1 deletions
diff --git a/program/lib/Roundcube/rcube_washtml.php b/program/lib/Roundcube/rcube_washtml.php
index 2a261419f..27dff9f48 100644
--- a/program/lib/Roundcube/rcube_washtml.php
+++ b/program/lib/Roundcube/rcube_washtml.php
@@ -413,7 +413,8 @@ class rcube_washtml
// Remove invalid HTML comments (#1487759)
// Don't remove valid conditional comments
- $html = preg_replace('/<!--[^->[\n]*>/', '', $html);
+ // Don't remove MSOutlook (<!-->) conditional comments (#1489004)
+ $html = preg_replace('/<!--[^->\[\n]+>/', '', $html);
// turn relative into absolute urls
$html = self::resolve_base($html);