InternetMessageId In-Reply-To References Subject Prefix Normalized Subject in C#.NET

Encoding Denso QR Bar Code in C#.NET InternetMessageId In-Reply-To References Subject Prefix Normalized Subject

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Exchange also maintains a new set of conversation-specific properties to track the items in a conversation. These properties are as follows:

For example, if you reply to a message, Exchange knows that the original message and the reply are linked and part of the same conversation and will note this fact, which means that the entire conversation can be viewed as a whole for as long as the items exist in any folder in the mailbox. Figure 10-1 illustrates a conversation that spans five items, one of which is in the Deleted Items folder (and indicated with strikethrough).

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The implementation of conversation views differs slightly across platforms to take account of the different storage and user interface capabilities of each platform . For example, Outlook 2010 is capable of including items that are stored in PSTs in conversations and can therefore do a good job of creating conversation views when connected to servers other than Exchange, including Gmail and Hotmail; OWA can only include items that are available within a mailbox (including the archive mailbox); and Windows Mobile can only show items from the currently selected folder . User interface differences across different client platforms are an inevitable fact of computer life . This is one reason you should be sure to check new platforms to detect possible opportunities for user confusion before introducing a new platform into production .

Older items that have been in mailboxes for a long time or those that originate in nonExchange systems present a challenge for conversation views because all of their attributes might not be populated in the same way as are newly created items. To get around the problem, Exchange determines the items that form a conversation by using message subjects.

Sometimes this technique associating conversations by using message subjects can associate items that are not part of the same conversation together because they share the same subject . This is one reason to be careful with the Ignore feature in Outlook, which moves a selected item and all other current and future items in the same conversation to the Deleted Items folder .

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Exchange attempts to avoid problems caused by older messages that share the same subject with a more recent message by only adding items to conversations if they are within 72 hours of each other, on the basis that the accuracy of including items in conversations based on message subject degrades over time. If you change the subject on a message before you send a reply, you effectively create a new conversation. There is one exception to this rule, and that s when a user starts off a conversation with a message with a blank subject and someone subsequently updates the subject. Outlook 2010 includes additional code to allow it to implement conversation views when connected to older Exchange servers and non-Exchange servers. This code works, but because it has to function without any help from the server, it is slower and less accurate in terms of linking items together in a conversation than when Exchange 2010 and Outlook 2010 work together. In addition, the client has to process all actions for a conversation. For example, you can decide to ignore a conversation, which means that Outlook will automatically move any messages in that conversation into the Deleted Items folder. If Outlook 2010 is connected to a legacy Exchange server, it has to process new items as they arrive to decide whether they belong to the conversation that you ve just ignored. Outlook then has to suppress the items that it determines to be in the conversation. To improve efficiency of conversation processing, Exchange 2010 stores details of actions to apply to conversations in a hidden folder called Conversation Action Settings. The advantage of this approach is that the data are available to the server rather than being limited to Outlook. Thus, if you decide that you want to ignore a conversation, Exchange processes new items as they arrive into the mailbox and all clients see the same effect. Because some limitations exist in applying conversation views to folders hosted on nonExchange 2010 servers, Outlook 2010 allows you to suppress conversation views for 10