(Rx) Disposable in usage Observable.FromEventPattern

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C#

.NET

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C#4.0

.NET4

Hi guys.
I have one question about disposing resurces.

for event observation i use Rx(Reactive Extensions).

Observable.FromEventPattern<Outlook.NewMailReceivedEventArgs>(_outlookManager, "MailReceived", Scheduler.ThreadPool).           Throttle(TimeSpan.FromSeconds(.7)).ObserveOn(Scheduler.ThreadPool).Subscribe(evt =>
{
 //some work performs here...
},
ex => ViewModelLocator.Logger.Error("Error in mail pull workflow", ex)
, _cts.Token);

Do i need to provide some disposable here ??