[Bug 259151] Moving/copying messages to folders causes redownload of the entire folder [Exchange server]

[Thiago Macieira]

https://bugs.kde.org/show_bug.cgi?id=259151





--- Comment #5 from Thiago Macieira <thiago kde org>  2010-12-08 15:19:38 ---
Actually, come to think of it, I think the entire code is bogus. There's never
a good reason to redownload the entire mailbox as long as the UIDVALIDITY
remains the same.

The RFC says (2.3.1.1):
   [...] Unique identifiers
   are assigned in a strictly ascending fashion in the mailbox; [...]

   The unique identifier of a message MUST NOT change during the
   session, and SHOULD NOT change between sessions.  Any change of
   unique identifiers between sessions MUST be detectable using the
   UIDVALIDITY mechanism discussed below.
[...]
         1) Unique identifiers MUST be strictly ascending in the
            mailbox at all times. [...]

It looks to me like the code is checking the wrong parameter. The only valid
reason for redownloading everything is a change in UIDVALIDITY. As long as the
UIDVALIDITY remains the same, the client should simply download any UIDs it did
not know about.

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