I came across a strange problem today. A client who is using Outlook 2010 couldn't delete any emails. When trying to delete an email it came up with an error and said to run scanpst.exe. Running the scanning program found some errors and repaired them but it still didn't fix the issue.
Upon further investigation I noticed that you could permanently delete emails (ie press shift and then the del key). The issue was with just the Deleted Items folder as I couldn't manually move items from or to that folder.
I then exported the email to another PST file and then everything worked all ok.
This fix was for MS Outlook 2010 but it may also work with other versions. If it works for you on another version please leave a comment below.
I found it strange that the scanpst utility didn't fix it but an export to another PST files did (I also exported the Deleted Items folder) so thought I'd share it here and hopefully it saves someone else a headache!