[Dovecot] 1.0.15 -> 2.x upgrade for mass hosting environment

[lists at truthisfreedom.org.uk]

Quoting Timo Sirainen <tss at iki.fi>:

> On 1.3.2011, at 18.57, lists at truthisfreedom.org.uk wrote:
>> Yeah, we're actually now thinking that we should create a new   
>> cluster running dovecot 2.0, mount the existing control/maildir   
>> files from the current shared storage and then regenerate the   
>> indices before going live - would that work here? I'm struggling to  
>>  find anything in the docs that state the control files will be   
>> affected by the upgrade.
>
> v2.0 will read v1.x indexes just fine, no need to do any   
> regeneration. (But v2.0 indexes can be read only by v1.2.5+.)

OK, that's good to know.  Just to confirm, dovecot 2.0 *does not*  
upgrade any files by default?

M.