It is not seldom that ten or more messages have been send back and forth each containing duplicate content from previous emails. Microsoft’s Outlook Thread Compressor has been designed specifically to reduce the size of the Outlook mailboxes by removing unnecessary emails from a thread. That’s right, the tool will delete emails in Outlook. This leads to a very important word of caution: It is advised to create a backup of the Microsoft Outlook email folder before you start using the program. While it has been designed and tested carefully one cannot be cautious enough when it comes to programs like this.

There are a few rules that will keep Outlook Thread Compressor (via Technospot) from deleting mails. It will ignore emails containing attachments as it does not come with the means to compare the attachments as well. Another limitation is that it is only effective on internal mail as it uses the conversation threading properties that are preserved for Outlook Exchange messages.

The user can select an Outlook folder that should be processed by the program. The mails can be moved to another folder instead of being deleted right away which is another way of testing the program’s functionality. A list of exceptions can be filled to have certain email messages never deleted by the Outlook compression program.

Installation is a bit complex and requires administrator privileges. It is outlined at the program’s homepage. The program – although not actively developed for more than six years works with all versions of Microsoft Outlook that have been released after Windows 2000. It is also compatible with both Windows Vista and Windows 7.

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