The following code has cost me allot of time. It was very hard to find the pieces and put them together. So I hope I can help a few of you with that post ;-)
The Problem
The problem was that I need to access different Exchange accounts via Exchange Web Services (EWS) and read out the mailbox size.
First
To do this I first used a view only account in the active directory that I have activated for impersonation by typing the following code into the Exchange-Shell:
Get-ExchangeServer
| where {$_.IsClientAccessServer -eq $TRUE}
| ForEach-Object {Add-ADPermission -Identity $_.distinguishedname -User (Get-User -Identity User1 | select-object)
.identity -extendedRight ms-Exch-EPI-Impersonation}
You can find an explanation to this code on msdn: http://msdn.microsoft.com/en-us/library/bb204095(EXCHG.80).aspx
Second
Then I set up the connection string to the EWS:
// Certification Validation always true
ServicePointManager.ServerCertificateValidationCallback =
delegate(
Object obj,
X509Certificate certificate,
X509Chain chain,
SslPolicyErrors errors)
{
return true;
};
// Setup connection string
ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2007_SP1);
service.Credentials = new NetworkCredential("viewadmin", "password", "FQDN");
service.AutodiscoverUrl("viewadmin@FQDN");
Third
Thirdly I used impersonation to connect to another mailbox account:
// Impersonate service.ImpersonatedUserId = new ImpersonatedUserId(ConnectingIdType.SmtpAddress, "user@FQDN");
Finally
And finally I requested the folder size with this nice little piece of code:
private static readonly ExtendedPropertyDefinition PidTagMessageSizeExtended = new ExtendedPropertyDefinition(0xe08, MapiPropertyType.Long);
/// <summary>
/// Gets the size of the mailbox in kilobytes.
/// </summary>
/// <param name="service">The ExchangeService object.</param>
/// <returns>Returns the used kilobytes in double.</returns>
public static double GetMailboxSize(ExchangeService service)
{
var offset = 0;
const int pagesize = 12;
long size = 0;
FindFoldersResults folders;
do
{
folders = service.FindFolders(WellKnownFolderName.MsgFolderRoot,
new FolderView(pagesize, offset, OffsetBasePoint.Beginning)
{
Traversal = FolderTraversal.Deep,
PropertySet =
new PropertySet(BasePropertySet.IdOnly, PidTagMessageSizeExtended,
FolderSchema.DisplayName)
});
foreach (var folder in folders)
{
long folderSize;
if (folder.TryGetProperty(PidTagMessageSizeExtended, out folderSize))
size += folderSize;
}
offset += pagesize;
} while (folders.MoreAvailable);
return size;
}
I hope I could help you. If you have improvements on the code don´t hazle to comment ;-)
