You can make reservations for pre-fetching messages in IMAP or NNTP folders. Reserved messages are marked with `!' but not cached yet. When Wanderlust becomes on-line, they are pre-fetched from servers.
If the variable elmo-enable-disconnected-operation is nil,
these off-line operations for IMAP4 and NNTP do not take place, and
off-line re-file, copy or suchlike simply results in error.
Because off-line operations use cache files, it is a bad idea to erase them by hand; it may cause Wanderlust to malfunction.
If you want to remove caches, be sure to execute M-x
elmo-cache-expire-by-size. elmo-cache-expire-by-size does not
remove caches for messages relevant to off-line operations.
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