It should be unique but best practice is to use both EntryID and StoreID, so
if I were you I'd persist both and use both.
<manojkurien@gmail.com> wrote in message
news:15d22319-1606-43a8-bcc3-7f7c7387b447@q27g2000prf.googlegroups.com...
> Hi,
>
> Is the EntryID property for an Outlook Folder guaranteed to be unique
> across multiple mail stores? My Outlook add in currently persists the
> only the EntryID of a folder selected by the user (typically in his
> default mail store, but theoretically could be from any of the stores
> available to the user) so as to be able to reference that folder. So
> when I need a reference to this folder, I use
> Namespace.GetFolderFromID(mySpecialFoldersEntryID), without specifying
> a StoreID. Is this guaranteed to work even if the user subsequently
> decides to configure multiple stores of any type? Or will I need to
> persist the StoreID of the folder as well?
>