What are the causes that MS Outlook 2007 freezes? It's OK a few seconds after launching the application but when I want to do some action (e.g. write new e-mail) it suddenly freezes. Is there some troubleshooting?
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I have experienced similar issues.
This was mostly related to either Xobni running or anti-virus. Try disabling anything similar you might have installed and see if the problem re-occurs.
Aside from that, you could always upgrade to 2010, but that might be cost-prohibited.
Recreating your .OST file should fix this issue.
Open Outlook>File>Data File Management>Data Files
Remove file name outlook.ost