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Editorial Team
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Asked: 2026-05-16T23:45:24+00:00

I’m trying to retrieve an outlook (2007) folder using something like this: Outlook.NameSpace MAPINameSpace

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I’m trying to retrieve an outlook (2007) folder using something like this:

Outlook.NameSpace MAPINameSpace = Application.GetNamespace("MAPI");
string storeID = MAPINameSpace.GetDefaultFolder(Outlook.OlDefaultFolders.olFolderInbox).StoreID;
Outlook.MAPIFolder folder = MAPINameSpace.GetItemFromID(folderID, storeID);

I get an exception: “Could not open the item. Try again.”.

I’ve tried not including storeID, passing null, passing Type.Missing — none of them work. I’ve confirmed that the folderID and storeID are valid… With the exception message being as helpful as it is — can anyone suggest a way to diagnose this?

Thanks!

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1 Answer

  1. Editorial Team

    Pff! I ended up putting all the folders in a Dictionary<> using the folder ID as the key. Doesn’t seem noticeably slow, for a few hundred folders.

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