Thank you for replay.

The data i need to store are user's details id, user name, ....

Each user has his own folder and sub-folders and also may have other
users folders (delegate)
and to these folders i need to store data. I think it's better to
store hidden item per user's folder
e.g. i have folder AAAAA inside this folder i create hidden item with
user's details, for subfolder
i wouldn't ceate hidden item, cause i can check where i locate in
hierarchy


How i set named properties to hidden item via redemption??
that's what i do:

...........
.........
RDO.RDOFolder rFolder = RdoSession.GetFolderFromID(folderEntryID,
folderStoreID, Type.Missing);
RDO.RDOItems rHiddenItems = rFolder.HiddenItems;

/*i will identify my hidden item by subject.*/

..... i check here if item with such subject already exists


rHiddenItem = rFolder.HiddenItems.Add("IPM.Note");
rHiddenItem.Subject = ... some constant string .....;
rHiddenItem.Save();

here i shlould add named properties, how should i add them ?? by help
of
MAPIUtils.HrSetOneProp(rHiddenItem.MAPIOBJECT,
propID, .................
or there are other posibilities?? and also for get these properties.


Thanks in advance.