Aspose.Email是一款功能十分强大的，类似Outlook的邮件处理控件，可以处理Outlook PST, EML, MSG和MHT等文件，支持邮件的发送、合并、导出和处理等，在新版5.4中对于以往的版本在功能上做了一些增强和BUG的修复，具体如下：

• 提供了合并两个pst文件和分割一个pst文件为几个为几个指定大小的pst文件
• 新增定义是否一个消息是否被送达
• 添加异步操作基于SequenceNumber到Pop3客户端
• 支持保存ExchangeTask到硬盘
• 新增了异常处理当添加 Cryillic字符到消息头
• 提供支持设置SentRepresentingEmailAddress到交换格式的地址
• 支持 (EWS) with Office 365

下面的一些API发生了改变：

Method Aspose.Email.Mail.MailMessage.CheckBounced
Method Aspose.Email.Outlook.MapiMessage.CheckBounced
Class Aspose.Email.Mail.Bounce.BounceResult
Enum Aspose.Email.Mail.Bounce.DSNAction

Class Aspose.Email.OAuthNetworkCredential

Class Aspose.Email.Outlook.Pst.StorageProcessedEventArgs
Class Aspose.Email.Outlook.Pst.StorageProcessedEventHandler
Event Aspose.Email.Outlook.Pst.PersonalStorage.ItemMoved
Event Aspose.Email.Outlook.Pst.PersonalStorage.StorageProcessed
Method Aspose.Email.Outlook.Pst.FolderInfo.MergeWith(Aspose.Email.Outlook.Pst.FolderInfo)
Method Aspose.Email.Outlook.Pst.PersonalStorage.MergeWith(System.String[])
Method Aspose.Email.Outlook.Pst.PersonalStorage.SplitInto(System.Int32,System.String)

Method Aspose.Email.Mail.Task.ToMapiTask
Method Aspose.Email.Exchange.ExchangeTask.ToMapiTask
Method Aspose.Email.Mail.Task.Save(System.IO.Stream)
Method Aspose.Email.Mail.Task.Save(System.IO.Stream,Aspose.Email.Outlook.TaskSaveFormat)
Method Aspose.Email.Mail.Task.Save(System.String)
Method Aspose.Email.Mail.Task.Save(System.String,Aspose.Email.Outlook.TaskSaveFormat)

Property Aspose.Email.Outlook.MapiCalendarDailyRecurrencePattern.DayOfWeek
Property Aspose.Email.Outlook.MapiCalendarRecurrencePattern.SlidingFlag