Microsoft Outlook 2007 Service Pack 1 freezes and hangs occasionally for some users depending on their activities.
A search on Google revealed more than 250000 pages for the search term Outlook Freezes. The developer of the Defrost Outlook software mentions one instance where his software can help overcome a seemingly frozen Microsoft Outlook: Fix for the hang of Microsoft Outlook when receiving meeting / appointments with HMTL entities.
The first public release of Defrost Outlook has the version number 0.8 and the author Daniel Cohen asking the users to contribute by sending him error reports and descriptions of hangs in Microsoft Outlook.
The source code and the binary of the application are available for download. The binary can be installed as a plugin for Microsoft Outlook and intercepts appointments and fixes them so that they do not freeze the system. The plugin is a workaround until Microsoft publishes an official fix for the bug.
Some user report that the freezes started after installing Service Pack 1 for Microsoft Office and that they would not happen if in Microsoft Outlook without installed Service Pack 1 for Microsoft Office.
Update: Microsoft has released a hotfix that is taking care of the freezing issues that Outlook 2007 users may experience when they work with the email client.
Note that the hotfix fixes Microsoft Word, which may sound strange at first as you are experiencing issues in Outlook and not in the word processing software. Outlook uses Word's document display engine for its emails, so that where it makes sense again.
If you are experiencing issues in Outlook 2007 make sure you have installed all service packs that Microsoft has released for the program before you install the hotfix. It may be that Microsoft has added the hotfix to a service pack that got released after the hotfix's release date.
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