Since upgrading to Tiger (Mac OS X 10.4), I have been having severe problems with the Mail app.
On receiving a new mail and selecting it, the email displays the notice “Loading message…” and no more appears to happen. Opening the Activity Viewer, you see a progress bar and a “Updating cache directory, Comparing notes with server…”. The progress bar goes nowhere even when left for hours on end.
The only way to view the message is to quit Mail and re-open it again. This happens for each new mail coming in.
Deleting the Library -> Caches -> Mail folder doesn’t help. Similarly, deleting the com.apple.mail.plist, doesn’t help either. I found both suggestions after searching on Google.
When that didn’t work, I re-installed Tiger – this time instead of doing a basic upgrade, I did an upgrade and archive in order that I’d get a completely new version of Tiger.
The same problem recurred after the re-install. AAAAAhhhhhhhhhhhhh!!!!!!!!!
If I don’t resolve this soon, I’ll have to start using Thunderbird which would be a shame, ‘cos I quite liked Mail and I have been using it without any problems for the last 3 or 4 years.
I finally resolved my Mail problem – see this post for more