diff --git a/src/java/davmail/exchange/ExchangeSession.java b/src/java/davmail/exchange/ExchangeSession.java
index 2b247d10..f5bf84b2 100644
--- a/src/java/davmail/exchange/ExchangeSession.java
+++ b/src/java/davmail/exchange/ExchangeSession.java
@@ -742,6 +742,8 @@ public abstract class ExchangeSession {
 
     public abstract Condition equals(String attributeName, String value);
 
+    public abstract Condition equals(String attributeName, int value);
+
     public abstract Condition headerEquals(String headerName, String value);
 
     public abstract Condition gte(String attributeName, String value);
@@ -2586,7 +2588,7 @@ public abstract class ExchangeSession {
     public List<Event> getEventMessages(String folderPath) throws IOException {
         return searchEvents(folderPath, ITEM_PROPERTIES,
                 and(equals("contentclass", "urn:content-classes:calendarmessage"),
-                        isFalse("processed")));
+                        or(isNull("processed"), isFalse("processed"))));
     }
 
     /**
@@ -2614,8 +2616,8 @@ public abstract class ExchangeSession {
 
         return searchEvents(folderPath, ITEM_PROPERTIES,
                 and(or(isNull("instancetype"),
-                        equals("instancetype", "1"),
-                        and(equals("instancetype", "0"), dateCondition)),
+                        equals("instancetype", 1),
+                        and(equals("instancetype", 0), dateCondition)),
                         equals("contentclass", "urn:content-classes:appointment"),
                         privateCondition));
     }
diff --git a/src/java/davmail/exchange/dav/DavExchangeSession.java b/src/java/davmail/exchange/dav/DavExchangeSession.java
index f5db5c5e..bb161ba4 100644
--- a/src/java/davmail/exchange/dav/DavExchangeSession.java
+++ b/src/java/davmail/exchange/dav/DavExchangeSession.java
@@ -272,19 +272,29 @@ public class DavExchangeSession extends ExchangeSession {
         operatorMap.put(Operator.IsLessThan, " < ");
         operatorMap.put(Operator.Like, " like ");
         operatorMap.put(Operator.IsNull, " is null");
-        operatorMap.put(Operator.IsFalse, " is false");
+        operatorMap.put(Operator.IsFalse, " = false");
+        operatorMap.put(Operator.IsTrue, " = true");
     }
 
     protected static class AttributeCondition extends ExchangeSession.AttributeCondition {
+        protected boolean isIntValue = false;
+
         protected AttributeCondition(String attributeName, Operator operator, String value) {
             super(attributeName, operator, value);
         }
 
+        protected AttributeCondition(String attributeName, Operator operator, int value) {
+            super(attributeName, operator, String.valueOf(value));
+            isIntValue = true;
+        }
+
         @Override
         public void appendTo(StringBuilder buffer) {
             buffer.append('"').append(Field.get(attributeName).getUri()).append('"');
             buffer.append(operatorMap.get(operator));
-            buffer.append('\'');
+            if (!isIntValue) {
+                buffer.append('\'');
+            }
             if (Operator.Like == operator) {
                 buffer.append('%');
             }
@@ -292,7 +302,9 @@ public class DavExchangeSession extends ExchangeSession {
             if (Operator.Like == operator) {
                 buffer.append('%');
             }
-            buffer.append('\'');
+            if (!isIntValue) {
+                buffer.append('\'');
+            }
         }
     }
 
@@ -354,6 +366,11 @@ public class DavExchangeSession extends ExchangeSession {
         return new AttributeCondition(attributeName, Operator.IsEqualTo, value);
     }
 
+    @Override
+    public Condition equals(String attributeName, int value) {
+        return new AttributeCondition(attributeName, Operator.IsEqualTo, value);
+    }
+
     @Override
     public Condition headerEquals(String headerName, String value) {
         return new HeaderCondition(headerName, Operator.IsEqualTo, value);
@@ -428,9 +445,9 @@ public class DavExchangeSession extends ExchangeSession {
         public Event(MultiStatusResponse multiStatusResponse) throws URIException {
             href = URIUtil.decode(multiStatusResponse.getHref());
             DavPropertySet properties = multiStatusResponse.getProperties(HttpStatus.SC_OK);
-            permanentUrl = getPropertyIfExists(properties, "permanenturl", SCHEMAS_EXCHANGE);
-            etag = getPropertyIfExists(properties, "getetag", DAV);
-            displayName = getPropertyIfExists(properties, "displayname", DAV);
+            permanentUrl = getPropertyIfExists(properties, "permanenturl");
+            etag = getPropertyIfExists(properties, "etag");
+            displayName = getPropertyIfExists(properties, "displayname");
         }
 
         public Event(String messageUrl, String contentClass, String itemBody, String etag, String noneMatch) {
@@ -651,8 +668,8 @@ public class DavExchangeSession extends ExchangeSession {
         }
     }
 
-    protected String getPropertyIfExists(DavPropertySet properties, String name) {
-        DavProperty property = properties.get(name, EMPTY);
+    protected String getPropertyIfExists(DavPropertySet properties, String alias) {
+        DavProperty property = properties.get(Field.getResponsePropertyName(alias));
         if (property == null) {
             return null;
         } else {
@@ -660,8 +677,8 @@ public class DavExchangeSession extends ExchangeSession {
         }
     }
 
-    protected int getIntPropertyIfExists(DavPropertySet properties, String name) {
-        DavProperty property = properties.get(name, EMPTY);
+    protected int getIntPropertyIfExists(DavPropertySet properties, String alias) {
+        DavProperty property = properties.get(Field.getResponsePropertyName(alias));
         if (property == null) {
             return 0;
         } else {
@@ -669,8 +686,8 @@ public class DavExchangeSession extends ExchangeSession {
         }
     }
 
-    protected long getLongPropertyIfExists(DavPropertySet properties, String name) {
-        DavProperty property = properties.get(name, EMPTY);
+    protected long getLongPropertyIfExists(DavPropertySet properties, String alias) {
+        DavProperty property = properties.get(Field.getResponsePropertyName(alias));
         if (property == null) {
             return 0;
         } else {
@@ -768,14 +785,15 @@ public class DavExchangeSession extends ExchangeSession {
     public MultiStatusResponse[] searchItems(String folderName, List<String> attributes, Condition condition) throws IOException {
         String folderUrl = getFolderPath(folderName);
         StringBuilder searchRequest = new StringBuilder();
-        searchRequest.append("Select \"http://schemas.microsoft.com/exchange/permanenturl\" as permanenturl");
+        searchRequest.append("SELECT ")
+                .append(Field.getRequestPropertyString("permanenturl"));
         if (attributes != null) {
             for (String attribute : attributes) {
                 Field field = Field.get(attribute);
-                searchRequest.append(",\"").append(field.getUri()).append("\" as ").append(field.getAlias());
+                searchRequest.append(',').append(Field.getRequestPropertyString(field.getAlias()));
             }
         }
-        searchRequest.append(" FROM Scope('SHALLOW TRAVERSAL OF \"").append(folderUrl).append("\"')")
+        searchRequest.append(" FROM SCOPE('SHALLOW TRAVERSAL OF \"").append(folderUrl).append("\"')")
                 .append(" WHERE \"DAV:ishidden\" = False AND \"DAV:isfolder\" = False");
         if (condition != null) {
             searchRequest.append(" AND ");
diff --git a/src/java/davmail/exchange/dav/Field.java b/src/java/davmail/exchange/dav/Field.java
index 36a486a4..75698d83 100644
--- a/src/java/davmail/exchange/dav/Field.java
+++ b/src/java/davmail/exchange/dav/Field.java
@@ -61,6 +61,9 @@ public class Field {
                     '{' + distinguishedPropertySetMap.get(DistinguishedPropertySetType.InternetHeaders) + "}/");
 
 
+    /**
+     * Property type list from EWS
+     */
     protected static enum PropertyType {
         ApplicationTime, ApplicationTimeArray, Binary, BinaryArray, Boolean, CLSID, CLSIDArray, Currency, CurrencyArray,
         Double, DoubleArray, Error, Float, FloatArray, Integer, IntegerArray, Long, LongArray, Null, Object,
@@ -116,7 +119,7 @@ public class Field {
         createField("iconIndex", 0x1080, PropertyType.Integer);//PR_ICON_INDEX        
         createField(URN_SCHEMAS_HTTPMAIL, "read");
         //createField("read", 0x0e69, PropertyType.Boolean);//PR_READ
-        createField("deleted", DistinguishedPropertySetType.Common, 0x8570);
+        createField("deleted", DistinguishedPropertySetType.Common, 0x8570, "deleted");
         createField("writedeleted", DistinguishedPropertySetType.Common, 0x8570, PropertyType.Custom);
         // http://schemas.microsoft.com/mapi/id/{00062008-0000-0000-C000-000000000046}/0x8506 private
         createField(URN_SCHEMAS_HTTPMAIL, "date");//PR_CLIENT_SUBMIT_TIME, 0x0039
@@ -158,9 +161,9 @@ public class Field {
         fieldMap.put(field.alias, field);
     }
 
-    protected static void createField(String alias, DistinguishedPropertySetType propertySetType, int propertyTag) {
+    protected static void createField(String alias, DistinguishedPropertySetType propertySetType, int propertyTag, String responseAlias) {
         String name = '{' + distinguishedPropertySetMap.get(propertySetType) + "}/0x" + Integer.toHexString(propertyTag);
-        Field field = new Field(alias, SCHEMAS_MAPI_ID, name);
+        Field field = new Field(alias, SCHEMAS_MAPI_ID, name, responseAlias);
         fieldMap.put(field.alias, field);
     }
 
@@ -185,15 +188,25 @@ public class Field {
     protected final DavPropertyName davPropertyName;
     protected final String alias;
     protected final String uri;
+    protected final String requestPropertyString;
 
     public Field(Namespace namespace, String name) {
         this(name, namespace, name);
     }
 
     public Field(String alias, Namespace namespace, String name) {
+        this(alias, namespace, name, null);
+    }
+
+    public Field(String alias, Namespace namespace, String name, String responseAlias) {
         davPropertyName = DavPropertyName.create(name, namespace);
         this.alias = alias;
         this.uri = namespace.getURI() + name;
+        if (responseAlias == null) {
+            this.requestPropertyString = '"' + uri + '"';
+        } else {
+            this.requestPropertyString = '"' + uri + "\" as " + responseAlias;
+        }
     }
 
     public String getUri() {
@@ -236,4 +249,13 @@ public class Field {
             return new DefaultDavProperty(Field.get(alias).davPropertyName, value);
         }
     }
+
+
+    public static DavPropertyName getResponsePropertyName(String alias) {
+        return Field.get(alias).davPropertyName;
+    }
+
+    public static String getRequestPropertyString(String alias) {
+        return Field.get(alias).requestPropertyString;
+    }
 }
diff --git a/src/java/davmail/exchange/ews/EwsExchangeSession.java b/src/java/davmail/exchange/ews/EwsExchangeSession.java
index 10277a18..c9269868 100644
--- a/src/java/davmail/exchange/ews/EwsExchangeSession.java
+++ b/src/java/davmail/exchange/ews/EwsExchangeSession.java
@@ -237,6 +237,11 @@ public class EwsExchangeSession extends ExchangeSession {
         return new AttributeCondition(attributeName, Operator.IsEqualTo, value);
     }
 
+    @Override
+    public Condition equals(String attributeName, int value) {
+        return new AttributeCondition(attributeName, Operator.IsEqualTo, String.valueOf(value));
+    }
+
     @Override
     public Condition headerEquals(String headerName, String value) {
         return new HeaderCondition(headerName, Operator.IsEqualTo, value);