diff --git a/mail/kopano/core/Makefile b/mail/kopano/core/Makefile
index d8d11163258..9d88acdc320 100644
--- a/mail/kopano/core/Makefile
+++ b/mail/kopano/core/Makefile
@@ -1,11 +1,11 @@
-# $OpenBSD: Makefile,v 1.3 2017/11/04 16:54:24 naddy Exp $
+# $OpenBSD: Makefile,v 1.4 2017/11/08 05:37:16 ajacoutot Exp $
 
 COMMENT-main=	MS Exchange groupware suite replacement
 COMMENT-mapi=	kopano MAPI extensions for PHP
 
 PKGNAME-main=	kopano-core-${V}.${BUILD}
 PKGNAME-mapi=	kopano-mapi-${V}.${BUILD}
-REVISION=	0
+REVISION=	1
 
 CATEGORIES=	mail www productivity
 
diff --git a/mail/kopano/core/patches/patch-libicalmapi_icalrecurrence_cpp b/mail/kopano/core/patches/patch-libicalmapi_icalrecurrence_cpp
new file mode 100644
index 00000000000..ddd6f35eb82
--- /dev/null
+++ b/mail/kopano/core/patches/patch-libicalmapi_icalrecurrence_cpp
@@ -0,0 +1,25 @@
+$OpenBSD: patch-libicalmapi_icalrecurrence_cpp,v 1.1 2017/11/08 05:37:16 ajacoutot Exp $
+
+Fix build with libical >= 3.0.0
+
+Index: libicalmapi/icalrecurrence.cpp
+--- libicalmapi/icalrecurrence.cpp.orig
++++ libicalmapi/icalrecurrence.cpp
+@@ -776,7 +776,7 @@ HRESULT ICalRecurrence::HrCreateICalRecurrence(TIMEZON
+ 			else
+ 				ittExDate = icaltime_from_timet_with_zone(LocalToUTC(exc, sTimeZone), 0, nullptr);
+ 
+-			ittExDate.is_utc = 1;
++			ittExDate.zone = icaltimezone_get_utc_timezone();
+ 
+ 			icalcomponent_add_property(lpicEvent, icalproperty_new_exdate(ittExDate));
+ 		}
+@@ -888,7 +888,7 @@ HRESULT ICalRecurrence::HrCreateICalRecurrenceType(TIM
+ 		icRec.count = 0;
+ 		// if untiltime is saved as UTC it breaks last occurrence.
+ 		icRec.until = icaltime_from_timet_with_zone(lpRecurrence->getEndDate() + lpRecurrence->getStartTimeOffset(), bIsAllday, nullptr);
+-		icRec.until.is_utc = 0;
++		icRec.until.zone = NULL;
+ 		break;
+ 	case recurrence::NUMBER:
+ 		icRec.count = lpRecurrence->getCount();
diff --git a/mail/kopano/core/patches/patch-libicalmapi_valarm_cpp b/mail/kopano/core/patches/patch-libicalmapi_valarm_cpp
new file mode 100644
index 00000000000..89563043cec
--- /dev/null
+++ b/mail/kopano/core/patches/patch-libicalmapi_valarm_cpp
@@ -0,0 +1,16 @@
+$OpenBSD: patch-libicalmapi_valarm_cpp,v 1.1 2017/11/08 05:37:16 ajacoutot Exp $
+
+Fix build with libical >= 3.0.0
+
+Index: libicalmapi/valarm.cpp
+--- libicalmapi/valarm.cpp.orig
++++ libicalmapi/valarm.cpp
+@@ -58,7 +58,7 @@ HRESULT HrParseReminder(LONG lRemindBefore, time_t ttR
+ 
+ 	if (ttReminderTime && bTask) {
+ 		sittTrigger.time = icaltime_from_timet_with_zone(ttReminderTime, false, nullptr);			// given in UTC
+-		sittTrigger.time.is_utc = 1;
++		sittTrigger.time.zone = icaltimezone_get_utc_timezone();
+ 	} else
+ 		sittTrigger.duration = icaldurationtype_from_int(-1 * lRemindBefore * 60);	// set seconds
+ 
diff --git a/mail/kopano/core/patches/patch-libicalmapi_vconverter_cpp b/mail/kopano/core/patches/patch-libicalmapi_vconverter_cpp
new file mode 100644
index 00000000000..d2aa9acfeb7
--- /dev/null
+++ b/mail/kopano/core/patches/patch-libicalmapi_vconverter_cpp
@@ -0,0 +1,25 @@
+$OpenBSD: patch-libicalmapi_vconverter_cpp,v 1.1 2017/11/08 05:37:16 ajacoutot Exp $
+
+Fix build with libical >= 3.0.0
+
+Index: libicalmapi/vconverter.cpp
+--- libicalmapi/vconverter.cpp.orig
++++ libicalmapi/vconverter.cpp
+@@ -1998,7 +1998,7 @@ HRESULT VConverter::HrSetTimeProperties(LPSPropValue l
+ 	auto lpPropVal = PCpropFindProp(lpMsgProps, ulMsgProps, PR_CREATION_TIME);
+ 	if (lpPropVal) {
+ 		ittICalTime = icaltime_from_timet_with_zone(FileTimeToUnixTime(lpPropVal->Value.ft.dwHighDateTime, lpPropVal->Value.ft.dwLowDateTime), 0, nullptr);
+-		ittICalTime.is_utc = 1;
++		ittICalTime.zone = icaltimezone_get_utc_timezone();
+ 
+ 		lpProp = icalproperty_new_created(ittICalTime);
+ 		icalcomponent_add_property(lpEvent, lpProp);
+@@ -2019,7 +2019,7 @@ HRESULT VConverter::HrSetTimeProperties(LPSPropValue l
+ 	lpPropVal = PCpropFindProp(lpMsgProps, ulMsgProps, PR_LAST_MODIFICATION_TIME);
+ 	if (lpPropVal) {
+ 		ittICalTime = icaltime_from_timet_with_zone(FileTimeToUnixTime(lpPropVal->Value.ft.dwHighDateTime, lpPropVal->Value.ft.dwLowDateTime), 0, nullptr);
+-		ittICalTime.is_utc = 1;
++		ittICalTime.zone = icaltimezone_get_utc_timezone();
+ 
+ 		lpProp = icalproperty_new_lastmodified(ittICalTime);
+ 		icalcomponent_add_property(lpEvent,lpProp);
diff --git a/mail/kopano/core/patches/patch-libicalmapi_vtimezone_cpp b/mail/kopano/core/patches/patch-libicalmapi_vtimezone_cpp
new file mode 100644
index 00000000000..c17055e05c9
--- /dev/null
+++ b/mail/kopano/core/patches/patch-libicalmapi_vtimezone_cpp
@@ -0,0 +1,25 @@
+$OpenBSD: patch-libicalmapi_vtimezone_cpp,v 1.1 2017/11/08 05:37:16 ajacoutot Exp $
+
+Fix build with libical >= 3.0.0
+
+Index: libicalmapi/vtimezone.cpp
+--- libicalmapi/vtimezone.cpp.orig
++++ libicalmapi/vtimezone.cpp
+@@ -176,7 +176,7 @@ static HRESULT HrZoneToStruct(icalcomponent_kind kind,
+ 	iterComp = icalcomponent_get_first_component(lpVTZ, kind);
+ 	while (iterComp != NULL) {
+ 		icTime = icalcomponent_get_dtstart(iterComp);
+-		icTime.is_utc = 1;
++		icTime.zone = icaltimezone_get_utc_timezone();
+ 		struct tm start = UTC_ICalTime2UnixTime(icTime);
+ 		if (time(NULL) < mktime(&start) && icComp != nullptr)
+ 			break;
+@@ -197,7 +197,7 @@ static HRESULT HrZoneToStruct(icalcomponent_kind kind,
+ 		return MAPI_E_NOT_FOUND;
+ 
+ 	icTime = icalcomponent_get_dtstart(icComp);
+-	icTime.is_utc = 1;
++	icTime.zone = icaltimezone_get_utc_timezone();
+ 
+ 	if (kind == ICAL_XSTANDARD_COMPONENT) {
+ 		// this is set when we request the STD timezone part.