[Dovecot] Data loss from removing dovecot.index* files?

[Patrick Nagel]

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Timo Sirainen wrote:
> On Tue, 2008-09-09 at 10:36 -0500, John Lightsey wrote:
>> Hi there,
>>
>> I've been rewriting the courier-dovecot-migrate script to handle  
>> dovecot->courier conversions in addition to courier->dovecot.  One  
>> issue I've found is that when the courier->dovecot conversion is  
>> performed a second time (using --overwrite) and the dovecot-uidlist  
>> file is written again, Dovecot starts generating errors when accessing  
>> the maildir.  The simple fix is to remove all of the dovecot.index*  
>> files so they are rebuilt when the maildir is scanned again.  Is it  
>> safe to do this or is information stored in the index files that can't  
>> be rebuilt by Dovecot the next time it scans the maildir?
> 
> It's safe, but if any IMAP clients had seen the mailbox the first time
> they may become confused if the message UIDs change (which is also the
> reason Dovecot starts complaining).
> 

Aren't flags only stored in dovecot.index files when there are more than 26 of
them (and thus can't be stored in the filename)?

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