The problem is caused when Windows Mail does not close down fully even though you've closed it. This means it's still running even though it's not actually open -- and you can't have two instances of it running at the same time.
Two possible causes for this:
1. The "search indexer" may be preventing Windows Mail from closing properly. Easiest fix in that case is to turn it off:
The proper way to turn off SearchIndexer is:
* Go to Control Panel, Administrative Tools, Services.
* Right-click on Windows Search and disable it.
2. If the above doesn't fix it, your antivirus email scanning component may be preventing Windows Mail from closing properly, in which case you need to disable that particular component. You can still scan email attachments on demand yourself once you've saved them as a file on your PC.
Edited by pip22, 05 May 2008 - 03:57 AM.