diff --git a/app/src/main/java/org/tasks/Tasks.kt b/app/src/main/java/org/tasks/Tasks.kt
index 21fe1e02c..917af0cf2 100644
--- a/app/src/main/java/org/tasks/Tasks.kt
+++ b/app/src/main/java/org/tasks/Tasks.kt
@@ -19,6 +19,7 @@ import kotlinx.coroutines.launch
 import org.tasks.billing.BillingClient
 import org.tasks.billing.Inventory
 import org.tasks.caldav.property.Invite
+import org.tasks.caldav.property.OCInvite
 import org.tasks.caldav.property.OCOwnerPrincipal
 import org.tasks.caldav.property.PropertyUtils.register
 import org.tasks.caldav.property.ShareAccess
@@ -99,6 +100,7 @@ class Tasks : Application(), Configuration.Provider {
                 ShareAccess.Factory(),
                 Invite.Factory(),
                 OCOwnerPrincipal.Factory(),
+                OCInvite.Factory(),
         )
     }
 
diff --git a/app/src/main/java/org/tasks/caldav/CaldavClient.kt b/app/src/main/java/org/tasks/caldav/CaldavClient.kt
index 75dc00ee4..48bc87a1e 100644
--- a/app/src/main/java/org/tasks/caldav/CaldavClient.kt
+++ b/app/src/main/java/org/tasks/caldav/CaldavClient.kt
@@ -20,6 +20,7 @@ import okhttp3.OkHttpClient
 import org.tasks.R
 import org.tasks.Strings.isNullOrEmpty
 import org.tasks.caldav.property.Invite
+import org.tasks.caldav.property.OCInvite
 import org.tasks.caldav.property.OCOwnerPrincipal
 import org.tasks.caldav.property.ShareAccess
 import org.tasks.data.CaldavAccount
@@ -222,6 +223,7 @@ open class CaldavClient(
                 ShareAccess.NAME,
                 Invite.NAME,
                 OCOwnerPrincipal.NAME,
+                OCInvite.NAME,
         )
 
         private suspend fun DavResource.propfind(
diff --git a/app/src/main/java/org/tasks/caldav/property/OCAccess.kt b/app/src/main/java/org/tasks/caldav/property/OCAccess.kt
new file mode 100644
index 000000000..9a4c8fa2e
--- /dev/null
+++ b/app/src/main/java/org/tasks/caldav/property/OCAccess.kt
@@ -0,0 +1,41 @@
+package org.tasks.caldav.property
+
+import at.bitfire.dav4jvm.Property
+import at.bitfire.dav4jvm.XmlUtils.propertyName
+import org.tasks.BuildConfig
+import org.tasks.caldav.property.PropertyUtils.NS_OWNCLOUD
+import org.xmlpull.v1.XmlPullParser
+
+class OCAccess(parser: XmlPullParser) : Property {
+
+    lateinit var access: Property.Name
+        private set
+
+    init {
+        val depth = parser.depth
+        var eventType = parser.eventType
+        while (!(eventType == XmlPullParser.END_TAG && parser.depth == depth)) {
+            if (eventType == XmlPullParser.START_TAG && parser.depth == depth + 1) {
+                when (val name = parser.propertyName()) {
+                    SHARED_OWNER, READ_WRITE, NOT_SHARED, READ -> access = name
+                }
+            }
+            eventType = parser.next()
+        }
+        if (BuildConfig.DEBUG && parser.depth != depth) {
+            error("Assertion failed")
+        }
+    }
+
+    override fun toString(): String {
+        return "OCAccess(access=$access)"
+    }
+
+    companion object {
+        val ACCESS = Property.Name(NS_OWNCLOUD, "access")
+        val SHARED_OWNER = Property.Name(NS_OWNCLOUD, "shared-owner")
+        val READ_WRITE = Property.Name(NS_OWNCLOUD, "read-write")
+        val NOT_SHARED = Property.Name(NS_OWNCLOUD, "not-shared")
+        val READ = Property.Name(NS_OWNCLOUD, "read")
+    }
+}
diff --git a/app/src/main/java/org/tasks/caldav/property/OCInvite.kt b/app/src/main/java/org/tasks/caldav/property/OCInvite.kt
new file mode 100644
index 000000000..ff5fa9463
--- /dev/null
+++ b/app/src/main/java/org/tasks/caldav/property/OCInvite.kt
@@ -0,0 +1,39 @@
+package org.tasks.caldav.property
+
+import at.bitfire.dav4jvm.Property
+import at.bitfire.dav4jvm.PropertyFactory
+import at.bitfire.dav4jvm.XmlUtils.propertyName
+import org.tasks.BuildConfig
+import org.tasks.caldav.property.PropertyUtils.NS_OWNCLOUD
+import org.xmlpull.v1.XmlPullParser
+
+data class OCInvite(val users: List<OCUser>): Property {
+
+    companion object {
+        @JvmField
+        val NAME = Property.Name(NS_OWNCLOUD, "invite")
+
+        val USER = Property.Name(NS_OWNCLOUD, "user")
+    }
+
+    class Factory : PropertyFactory {
+
+        override fun getName() = NAME
+
+        override fun create(parser: XmlPullParser): OCInvite {
+            val depth = parser.depth
+            var eventType = parser.eventType
+            val users = ArrayList<OCUser>()
+            while (!(eventType == XmlPullParser.END_TAG && parser.depth == depth)) {
+                if (eventType == XmlPullParser.START_TAG && parser.depth == depth + 1) {
+                    if (parser.propertyName() == USER) {
+                        users.add(OCUser(parser))
+                    }
+                }
+                eventType = parser.next()
+            }
+            if (BuildConfig.DEBUG && parser.depth != depth) { error("Assertion failed") }
+            return OCInvite(users)
+        }
+    }
+}
diff --git a/app/src/main/java/org/tasks/caldav/property/OCUser.kt b/app/src/main/java/org/tasks/caldav/property/OCUser.kt
new file mode 100644
index 000000000..98fdf3cbd
--- /dev/null
+++ b/app/src/main/java/org/tasks/caldav/property/OCUser.kt
@@ -0,0 +1,49 @@
+package org.tasks.caldav.property
+
+import at.bitfire.dav4jvm.DavResource
+import at.bitfire.dav4jvm.Property
+import at.bitfire.dav4jvm.XmlUtils
+import at.bitfire.dav4jvm.XmlUtils.propertyName
+import org.tasks.BuildConfig
+import org.tasks.caldav.property.PropertyUtils.NS_OWNCLOUD
+import org.xmlpull.v1.XmlPullParser
+
+class OCUser(parser: XmlPullParser) {
+    lateinit var href: String
+        private set
+    lateinit var commonName: String
+        private set
+    lateinit var access: OCAccess
+        private set
+    lateinit var response: Property.Name
+        private set
+
+    init {
+        val depth = parser.depth
+        var eventType = parser.eventType
+        while (!(eventType == XmlPullParser.END_TAG && parser.depth == depth)) {
+            if (eventType == XmlPullParser.START_TAG && parser.depth == depth + 1) {
+                when (val name = parser.propertyName()) {
+                    DavResource.HREF ->
+                        XmlUtils.readText(parser)?.let { href = it }
+                    COMMON_NAME ->
+                        XmlUtils.readText(parser)?.let { commonName = it }
+                    OCAccess.ACCESS ->
+                        access = OCAccess(parser)
+                    INVITE_ACCEPTED, INVITE_DECLINED, INVITE_NORESPONSE, INVITE_INVALID ->
+                        response = name
+                }
+            }
+            eventType = parser.next()
+        }
+        if (BuildConfig.DEBUG && parser.depth != depth) { error("Assertion failed") }
+    }
+
+    companion object {
+        val COMMON_NAME = Property.Name(NS_OWNCLOUD, "common-name")
+        val INVITE_ACCEPTED = Property.Name(NS_OWNCLOUD, "invite-accepted")
+        val INVITE_DECLINED = Property.Name(NS_OWNCLOUD, "invite-declined")
+        val INVITE_NORESPONSE = Property.Name(NS_OWNCLOUD, "invite-noresponse")
+        val INVITE_INVALID = Property.Name(NS_OWNCLOUD, "invite-invalid")
+    }
+}
\ No newline at end of file
diff --git a/app/src/test/java/org/tasks/caldav/property/OCInviteTest.kt b/app/src/test/java/org/tasks/caldav/property/OCInviteTest.kt
new file mode 100644
index 000000000..4dec67e0f
--- /dev/null
+++ b/app/src/test/java/org/tasks/caldav/property/OCInviteTest.kt
@@ -0,0 +1,51 @@
+package org.tasks.caldav.property
+
+import at.bitfire.dav4jvm.PropertyRegistry
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertTrue
+import org.junit.Before
+import org.junit.Test
+import org.tasks.caldav.property.PropertyUtils.NS_OWNCLOUD
+import org.tasks.caldav.property.TestPropertyUtils.toProperty
+
+class OCInviteTest {
+    @Before
+    fun setUp() {
+        PropertyRegistry.register(OCInvite.Factory())
+    }
+
+    @Test
+    fun emptyInvite() =
+            assertTrue("<oc:invite />".toProperty<OCInvite>("oc" to NS_OWNCLOUD).users.isEmpty())
+
+    @Test
+    fun userHref() =
+            assertEquals("principal:principals/users/testuser", user(SHARED_USER).href)
+
+    @Test
+    fun commonName() = assertEquals("testuser", user(SHARED_USER).commonName)
+
+    @Test
+    fun access() = assertEquals(OCAccess.READ_WRITE, user(SHARED_USER).access.access)
+
+    @Test
+    fun response() = assertEquals(OCUser.INVITE_ACCEPTED, user(SHARED_USER).response)
+
+    private fun user(xml: String) =
+            xml.toProperty<OCInvite>("oc" to NS_OWNCLOUD).users.first()
+
+    companion object {
+        private val SHARED_USER = """
+            <oc:invite>
+                <oc:user>
+                    <d:href>principal:principals/users/testuser</d:href>
+                    <oc:common-name>testuser</oc:common-name>
+                    <oc:invite-accepted />
+                    <oc:access>
+                        <oc:read-write />
+                    </oc:access>
+                </oc:user>
+            </oc:invite>
+        """.trimIndent()
+    }
+}
\ No newline at end of file
diff --git a/app/src/test/java/org/tasks/caldav/property/OCOwnerPrincipalTest.kt b/app/src/test/java/org/tasks/caldav/property/OCOwnerPrincipalTest.kt
index e0b3d90a5..6cef69510 100644
--- a/app/src/test/java/org/tasks/caldav/property/OCOwnerPrincipalTest.kt
+++ b/app/src/test/java/org/tasks/caldav/property/OCOwnerPrincipalTest.kt
@@ -4,6 +4,7 @@ import at.bitfire.dav4jvm.PropertyRegistry
 import org.junit.Assert.assertEquals
 import org.junit.Before
 import org.junit.Test
+import org.tasks.caldav.property.PropertyUtils.NS_OWNCLOUD
 import org.tasks.caldav.property.TestPropertyUtils.toProperty
 
 class OCOwnerPrincipalTest {
@@ -15,7 +16,7 @@ class OCOwnerPrincipalTest {
     @Test
     fun ownerPrincipal() {
         val owner = "<oc:owner-principal>principals/users/test</oc:owner-principal>"
-                .toProperty<OCOwnerPrincipal>("oc='${PropertyUtils.NS_OWNCLOUD}'")
+                .toProperty<OCOwnerPrincipal>("oc" to NS_OWNCLOUD)
 
         assertEquals("principals/users/test", owner.owner)
     }
diff --git a/app/src/test/java/org/tasks/caldav/property/TestPropertyUtils.kt b/app/src/test/java/org/tasks/caldav/property/TestPropertyUtils.kt
index ce8375d4e..54cfe1d89 100644
--- a/app/src/test/java/org/tasks/caldav/property/TestPropertyUtils.kt
+++ b/app/src/test/java/org/tasks/caldav/property/TestPropertyUtils.kt
@@ -5,8 +5,10 @@ import at.bitfire.dav4jvm.XmlUtils
 import java.io.StringReader
 
 object TestPropertyUtils {
-    fun <T: Property> String.toProperty(ns: String = """d="DAV:""""): T =
-            toProperties(ns)
+    private val DAV = "d" to XmlUtils.NS_WEBDAV
+
+    fun <T: Property> String.toProperty(vararg ns: Pair<String, String>): T =
+            toProperties(*ns)
                     .apply { if (this.size != 1) throw IllegalStateException("${this.size} items") }
                     .first()
                     .let {
@@ -14,12 +16,15 @@ object TestPropertyUtils {
                         it as T
                     }
 
-    fun String.toProperties(ns: String = """d="DAV:""""): List<Property> =
+    fun String.toProperties(vararg ns: Pair<String, String>): List<Property> =
             XmlUtils.newPullParser()
                     .apply {
+                        val namespaces = ns.toList().plus(DAV).joinToString(" ") {
+                            """xmlns:${it.first}="${it.second}""""
+                        }
                         setInput(
                                 StringReader("""
-                                    <test xmlns:$ns>
+                                    <test $namespaces>
                                         ${this@toProperties}
                                     </test>
                                     """.trimIndent()