diff --git a/package-lock.json b/package-lock.json
index 0a76ecdf4..67b6f1cbf 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -14,6 +14,7 @@
         "bootstrap5-tags": "^1.6.1",
         "color-hash": "^2.0.2",
         "dayjs": "^1.11.10",
+        "ical.js": "^2.0.1",
         "modern-screenshot": "^4.4.30",
         "prismjs": "^1.29.0",
         "rapidoc": "^9.3.4",
@@ -1701,6 +1702,11 @@
         "node": ">= 0.4"
       }
     },
+    "node_modules/ical.js": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/ical.js/-/ical.js-2.0.1.tgz",
+      "integrity": "sha512-uYYb1CwTXbd9NP/xTtgQZ5ivv6bpUjQu9VM98s3X78L3XRu00uJW5ZtmnLwyxhztpf5fSiRyDpFW7ZNCePlaPw=="
+    },
     "node_modules/ieee754": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/ieee754/-/ieee754-1.2.1.tgz",
diff --git a/package.json b/package.json
index 21ad28e4c..288d36b80 100644
--- a/package.json
+++ b/package.json
@@ -15,6 +15,7 @@
     "bootstrap5-tags": "^1.6.1",
     "color-hash": "^2.0.2",
     "dayjs": "^1.11.10",
+    "ical.js": "^2.0.1",
     "modern-screenshot": "^4.4.30",
     "prismjs": "^1.29.0",
     "rapidoc": "^9.3.4",
diff --git a/server/ui-src/components/message/Attachments.vue b/server/ui-src/components/message/Attachments.vue
index db2e4f8a3..fa350fed0 100644
--- a/server/ui-src/components/message/Attachments.vue
+++ b/server/ui-src/components/message/Attachments.vue
@@ -1,6 +1,7 @@
-
 <script>
 import commonMixins from '../../mixins/CommonMixins'
+import ICAL from "ical.js"
+import dayjs from 'dayjs'
 
 export default {
 	props: {
@@ -8,16 +9,72 @@ export default {
 		attachments: Object
 	},
 
-	mixins: [commonMixins]
+	mixins: [commonMixins],
+
+	data() {
+		return {
+			ical: false
+		}
+	},
+
+	methods: {
+		openAttachment: function (part, e) {
+			let filename = part.FileName
+			let contentType = part.ContentType
+			let href = this.resolve('/api/v1/message/' + this.message.ID + '/part/' + part.PartID)
+			if (filename.match(/\.ics$/i) || contentType == 'text/calendar') {
+				e.preventDefault()
+
+				this.get(href, null, (response) => {
+					let comp = new ICAL.Component(ICAL.parse(response.data))
+					let vevent = comp.getFirstSubcomponent('vevent')
+					if (!vevent) {
+						alert('Error parsing ICS file')
+						return
+					}
+					let event = new ICAL.Event(vevent)
+
+					let summary = {}
+					summary.link = href
+					summary.status = vevent.getFirstPropertyValue('status')
+					summary.url = vevent.getFirstPropertyValue('url')
+					summary.summary = event.summary
+					summary.description = event.description
+					summary.location = event.location
+					summary.start = dayjs(event.startDate).format('ddd, D MMM YYYY, h:mm a')
+					summary.end = dayjs(event.endDate).format('ddd, D MMM YYYY, h:mm a')
+					summary.isRecurring = event.isRecurring()
+					summary.organizer = event.organizer ? event.organizer.replace(/^mailto:/, '') : false
+					summary.attendees = []
+					event.attendees.forEach((a) => {
+						if (a.jCal[1].cn) {
+							summary.attendees.push(a.jCal[1].cn)
+						}
+					})
+
+					comp.getAllSubcomponents("vtimezone").forEach((vtimezone) => {
+						summary.timezone = vtimezone.getFirstPropertyValue("tzid")
+					})
+
+					this.ical = summary
+
+					// display modal
+					this.modal('ICSView').show()
+				})
+			}
+		}
+	},
 }
 </script>
 
 <template>
 	<div class="mt-4 border-top pt-4">
 		<a v-for="part in attachments" :href="resolve('/api/v1/message/' + message.ID + '/part/' + part.PartID)"
-			class="card attachment float-start me-3 mb-3" target="_blank" style="width: 180px">
-			<img v-if="isImage(part)" :src="resolve('/api/v1/message/' + message.ID + '/part/' + part.PartID + '/thumb')"
-				class="card-img-top" alt="">
+			class="card attachment float-start me-3 mb-3" target="_blank" style="width: 180px"
+			@click="openAttachment(part, $event)">
+			<img v-if="isImage(part)"
+				:src="resolve('/api/v1/message/' + message.ID + '/part/' + part.PartID + '/thumb')" class="card-img-top"
+				alt="">
 			<img v-else
 				src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAALQAAAB4AQMAAABhKUq+AAAAA1BMVEX///+nxBvIAAAAGUlEQVQYGe3BgQAAAADDoPtTT+EA1QAAgFsLQAAB12s2WgAAAABJRU5ErkJggg=="
 				class="card-img-top" alt="">
@@ -30,12 +87,79 @@ export default {
 					<small>{{ getFileSize(part.Size) }}</small>
 				</p>
 				<p class="card-text mb-0 small">
-					{{ part.FileName != '' ? part.FileName : '[ unknown ]' }}
+					{{ part.FileName != '' ? part.FileName : '[ unknown ]' + part.ContentType }}
 				</p>
 			</div>
 			<div class="card-footer small border-0 text-center text-truncate">
-				{{ part.FileName != '' ? part.FileName : '[ unknown ]' }}
+				{{ part.FileName != '' ? part.FileName : '[ unknown ]' + part.ContentType }}
 			</div>
 		</a>
 	</div>
+
+	<div class="modal fade" id="ICSView" tabindex="-1" aria-hidden="true">
+		<div class="modal-dialog modal-dialog-centered modal-dialog-scrollable modal-lg">
+			<div class="modal-content">
+				<div class="modal-header">
+					<h5 class="modal-title fs-5">
+						<i class="bi bi-calendar-event me-2"></i>
+						iCalendar summary
+					</h5>
+					<button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
+				</div>
+				<div class="modal-body" v-if="ical">
+					<table class="table">
+						<tbody>
+							<tr v-if="ical.summary">
+								<th>Summary</th>
+								<td>{{ ical.summary }}</td>
+							</tr>
+							<tr v-if="ical.description">
+								<th>Description</th>
+								<td>{{ ical.description }}</td>
+							</tr>
+							<tr>
+								<th>When</th>
+								<td>
+									{{ ical.start }} &mdash; {{ ical.end }}
+									<span v-if="ical.isRecurring">(recurring)</span>
+								</td>
+							</tr>
+							<tr v-if="ical.status">
+								<th>Status</th>
+								<td> {{ ical.status }}</td>
+							</tr>
+							<tr v-if="ical.location">
+								<th>Location</th>
+								<td>{{ ical.location }}</td>
+							</tr>
+							<tr v-if="ical.url">
+								<th>URL</th>
+								<td><a :href="ical.url" target="_blank">{{ ical.url }}</a></td>
+							</tr>
+							<tr v-if="ical.organizer">
+								<th>Organizer</th>
+								<td>{{ ical.organizer }}</td>
+							</tr>
+							<tr v-if="ical.attendees.length">
+								<th>Attendees</th>
+								<td>
+									<span v-for="(a, i) in ical.attendees">
+										<template v-if="i > 0">,</template>
+										{{ a }}
+									</span>
+								</td>
+							</tr>
+						</tbody>
+					</table>
+				</div>
+				<div class="modal-footer">
+					<button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Close</button>
+					<a class="btn btn-primary" target="_blank" :href="ical.link">
+						Download attachment
+					</a>
+				</div>
+			</div>
+		</div>
+	</div>
+
 </template>
diff --git a/server/ui-src/mixins/CommonMixins.js b/server/ui-src/mixins/CommonMixins.js
index 22ee4edca..3cc151258 100644
--- a/server/ui-src/mixins/CommonMixins.js
+++ b/server/ui-src/mixins/CommonMixins.js
@@ -243,6 +243,9 @@ export default {
 			if (['zip', 'tar', 'rar', 'bz2', 'gz', 'xz'].includes(ext)) {
 				return 'bi-file-zip-fill'
 			}
+			if (['ics'].includes(ext)) {
+				return 'bi-calendar-event'
+			}
 			if (a.ContentType.match(/^audio\//)) {
 				return 'bi-file-music-fill'
 			}