Re: does Exchange provide a unique id for messages?

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Henning,

are you saying I can't use WebDAV to get PR_EntryID and compare them? why
is that?
thanks,



"Henning Krause [MVP - Exchange]" wrote:

> Hello,
>
> PR_EntryID may be unique, but the only way to compare two entry ids is the
> IMAPISupport::CompareEntryIDs...
>
> If you are using MAPI, that may be fine... but for other access
> technologies, such as WebDAV, its pretty useless.
>
> Greetings,
> Henning Krause
> MVP - Exchange
> http://www.infinitec.de
>
>
> "Iv Borissov" <dummy@xxxxxxxxxxxxxxxxxxxx> wrote in message
> news:ugzOXMlmFHA.2152@xxxxxxxxxxxxxxxxxxxxxxx
> Again, read and learn MSDN, it is easy:
>
> FROM MSDN:
>
> The following table summarizes important differences among PR_ENTRYID,
> PR_RECORD_KEY, and PR_SEARCH_KEY.
>
> Characteristic PR_ENTRYID PR_RECORD_KEY PR_SEARCH_KEY
> Required on attachment objects No Yes No
> Required on folder objects Yes Yes No
> Required on message store objects Yes Yes No
> Required on status objects Yes No No
> Created by client No No Yes
> Available before call to SaveChanges Maybe Maybe Messages - Yes
> Others - Maybe
> Changed in a copy operation Yes Yes No
> Changeable by client after a copy No No Yes
> Unique within Entire world Provider instance Entire world
> Binary comparable (as with memcmp) No - use IMAPISupport::
> CompareEntryIDs Yes Yes
>
> --
>
>
> Each message have PR_ENTRYID Unique within Entire world .
>
> Because long-term entry identifiers must be unique, when a message or folder
> is copied from one message store to another, it must be assigned a new entry
> identifier. Service providers assign new entry identifiers to moved/copied
> objects.
>
> Iv Borissov
> IMI Support Team
> http://www.imibo.com/imidev/
>
> *everything that has a beginning has an end*
>
>
>
> "mynab" <mynab@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
> news:407057A8-30B1-423C-83EC-9CCD189F841F@xxxxxxxxxxxxxxxx
> > I believe the EntryID will change if the item is copied to another
> > location.
> > Therefore, it will not be 100% guaranteed unique.
> >
> > --
> > Thanks,
> > Andrew
> >
> >
> > "Iv Borissov" wrote:
> >
> > > Each message have unique Entry ID. It is Extended MAPI Property. Please
> > > see
> > > Entry Identifiers -
> > > http://msdn.microsoft.com/library/en-us/mapi/html/e76663ff-5119-4ecc-987e-c41ff7580437.asp
> > >
> > > Messaging API (MAPI) > Guide > MAPI Programming Basics > Entry
> > > Identifiers
> > >
> > > --
> > > Iv Borissov
> > > IMI Support Team
> > > http://www.imibo.com/imidev/
> > > *everything that has a beginning has an end*
> > >
> > >
> > >
> > > "struggling..." <struggling@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
> > > news:7CE1D808-3B31-4CB5-B42A-3E78683A9652@xxxxxxxxxxxxxxxx
> > > > Hi,
> > > > Is it the Message-ID header? or some other MAPI property?
> > > > thanks for the help.
> > > >
> > > >
> > > >
> > > >
> > > > "Iv Borissov" wrote:
> > > >
> > > > > Yes
> > > > >
> > > > > --
> > > > > Iv Borissov
> > > > > IMI Support Team
> > > > > http://www.imibo.com/imidev/
> > > > >
> > > > > *everything that has a beginning has an end*
> > > > >
> > > > >
> > > > >
> > > > > "struggling..." <struggling@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in
> > > > > message
> > > > > news:72C5DDE9-320A-4BD4-AB0B-D621F2521DD3@xxxxxxxxxxxxxxxx
> > > > > > Hi,
> > > > > >
> > > > > > Does Exchange Server provide a guaranteed unique id for stored
> > > > > > emails?
> > > > > > Thanks,
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > > >
> > >
> > >
> > >
>
>
>
.

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