Our exchange 2007 SP3 search index had worked, so far.
Its folder "catalog...someGUID" held about 750 MB.
Then, some people have complained, that they don't find certain certain mails any more although they know, they are there. Search results were indeed incomplete. That made me re-index the exchange server on friday following this procedure How to Rebuild the Full-Text Index Catalog
It went fine and the application event log reports "Exchange Search Indexer has created a new search index and will perform a full crawl for the Mailbox Database First Storage Group\Mailbox Database GUID...".
Problem: the catalog folder now holds less than 1 MB, and indexing is complete, the server is idling. The searches are terribly slow now, the index does not seem to hold anything anymore or is not even used!
How can I diagnose this dilemma?
Points will go to people that help me solve it, or at least help me understand what is going on.